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4 Inch WET Core Bits
Hub 1-1/4"-7 / Standard core length: 13"
Additional length bits may be special ordered on select bits at $4.50 per inch
Recommended RPM for best performance
Minimum RPM
597
Remommended RPM
795
Max RPM
995
4" Contractor Grade Wet Core Bits
Diamond Products Star Blue Bits
Good quality diamonds and good coring value. Basic Bit Life
$122.80
BOL Spec
General Purpose
Cured Concrete
Cat # 10057
Cutters Choice CBGH4000 General Purpose Bit
Economically designed to handle the miscellaneous jobs that don't require more expensive solutions.
$149.95
CBGH Spec
General Purpose
Moderate Steel
Diamond Products Standard Gold Bits
Better Quality Diamond and better Coring Value Designed for average duty wet core drilling
$163.20
SOL Spec
General Purpose
Cured Concrete
Cat # 80160
Diamond Products Heavy Duty Orange Bits
Excellent footage and drilling speed. Designed for all types of wet drilling applications with light to moderate steel
$196.00
HOL Spec
General Purpose
Longer Life
Cat # 00007
H38F Spec
Med Aggregate
w/ reinforcement
Cat # 45571
H42Z Spec
Hard River Rock
w/ reinforcement
Cat # 21917
H64L Spec
Asphalt
Block
Cat # 05060
Diamond Products Premium Black Bits
Very high diamond concentration. Premium Black gives maximum footage and drilling speed in all types of drilling applications
$233.20
POL Spec
General Purpose
Longer Life
Cat # 05761
P38Z Spec
Med Aggregate
w/ reinforcement
Cat # 05745
P64L Spec
Asphalt
Block
Cat # 05753
4" Professional Grade Wet Core Bits
Diamond Products Super Premium Red Bits
Super Premium Red bits are designed with the professional driller in mind. They have a wider spaced segment design which delivers more power to the cutting surface. This additional power results in faster coring and higher productivity. Higher quality diamonds.
$224.80
SPOL Spec
Wide Segments - Fast Drilling
Moderate Steel. Cat # 06654
Diamond Products Pro Blue Bits
Pro Blue bits are designed with the professional driller in mind. They have a wider spaced segment design which delivers more power to the cutting surface. This additional power results in faster coring and higher productivity. Very High quality diamonds.
$238.40
TOL Spec
Wide Segments - Fast Drilling
Moderate Steel. Cat # 06791
Cutters Choice CBSPS Bits
Hard Reinforced Concrete - Long Life Designed to handle the heavy steel in reinforced concrete better than other bits.
$239.95
CBSPS Spec
Hard reinforced - Long life.
Diamond Products Great White Bits
The Great White Core Bore bit is designed to "chew a hole" right through concrete with specialized diamond "Shark Tooth" segments. These 0.433" tall pointed segments offer fast coring and long life
$256.40
GWOL Spec
General Purpose
Med Aggregate
Cat # 80098
4" Turbo (Fast-Cut) Wet Core Bits
Diamond Products Star Blue Turbo Bits
Good Quality Diamond and good Coring Value Serrated segment for faster coring
$110.00
TBOWL Spec
General Purpose
Moderate Steel
Cat # 10266
Diamond Products Heavy Duty Orange Turbo Bits
Very high quality diamonds and longer coring life in medium aggregate concrete with moderate steel Serrated segment for faster coring
$179.60
THOWL Spec
General Purpose
Moderate Steel
Cat # 06901
Diamond Products Premium Black Turbo Bits
Highest quality diamonds and longest coring life in medium aggregate concrete with moderate steel Serrated segment for faster coring
$196.40
TPOWL Spec
General Purpose - Moderate Steel
Cat # 06974
Cutters Choice CBPDT Turbo Bits
Designed with hard conccrete in mind, the softer bonding material on these diamond core bits are designed to allow your diamonds to be applied evenly.
$209.95
CBPDT Spec
Hard Concrete - Moderate Steel
Diamond Products Super Premium Red Turbo Bits
High diamond concentration and quality for very long life. Fastest coring bit in various applications with moderate steel
$224.80
TSPOL Spec
General Purpose
Moderate Steel
Cat # 84824
TSPSAG3+ Spec
Hard Aggregate
Moderate Steel
Cat # 77474
TSP64L Spec
Asphalt Block
Fast Coring
Cat # 84856
4" Thin Wall (Hand-Held) Wet Core Bits
Note: All Diamond Products Thin Wall Bits have a 5/8"-11 Hub
Diamond Products Thin Wall Premium Black Bits
Very high diamond concentration. Premium Black gives maximum footage and drilling speed in all types of drilling applications
$156.80
POL Spec
General Purpose
Longer Life
Cat # 17828
P38Z Spec
Med Aggregate
w/ reinforcement
Cat # 22628
Diamond Products Thin Wall Supreme Silver Bits
Highest quality diamond concentration meant for smaller holes in very heavy steel and medium aggregate
$189.20
UOL Spec
General Purpose
Fast Drilling
Cat # 28534
U38Z Spec
General Purpose
with heavy steel
Cat # 79364

Factors that affect Core Drill Motor
performance and your profit margin

Speed
(RPM) - If the speed is too high the bit will polish. If the speed is too low the job will take too long. You will know if the bit is "Polished" or "Glazed" when it stops cutting, you have segments left, and you don't see exposed diamonds. To open up the diamonds try drilling in soft abrasive material like a cinder block. Be careful to not drill very much as you will be wasting diamonds.
Power
Necessary to maintain the proper cutting speed. Efficient cutting means keeping the bit at the right speed.
Water
Not too little and not too much. The right amount removes slurry and keeps the cut clean. Slurry water should look like "Coffee with cream"
Aggregate
You can't see it until you're done, but a good driller can feel the right speed and pressure to cut varying types of aggregate.
Steel
Slows down the cutting process. Maintaining drill motor speed is important. Don't push the bit too hard. Maintain even speed with even pressure.
Bond Specs
Too hard and it takes too long. Too soft and it costs too much money. Remember Hard bond for cutting soft abrasive materials, soft bond for cutting hard materials. "Hard on hard" won't cut, and "soft on soft" won't last.
Proper Alignment
Necessary for good bit life. This means the rig must be properly anchored. A rig can be anchored with concrete anchors, vacuum or a post jack.
Standing on the rig is DANGEROUS and not acceptable
Core Rig Maintenance
Performance, speed and bit life will mean little if your rig has bad shims, bearing and hold down devices.
Wet Core Bits by Size