4-1/4 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
562
Remommended RPM
749
Max RPM
937
4-1/4" Contractor Grade Wet Core Bits
Diamond Products Star Blue Bits
Good quality diamonds and good coring value.
Basic Bit Life
$136.80

BOL Spec
General Purpose
Cured Concrete
Cat # 10072
General Purpose
Cured Concrete
Cat # 10072


Cutters Choice CBGH4000 General Purpose Bit
Economically designed to handle the miscellaneous jobs that don't require more expensive solutions.
$169.95

CBGH Spec
General Purpose
Moderate Steel
General Purpose
Moderate Steel


Diamond Products Standard Gold Bits
Better Quality Diamond and better Coring Value
Designed for average duty wet core drilling
$186.00

SOL Spec
General Purpose
Cured Concrete
Cat # 80161
General Purpose
Cured Concrete
Cat # 80161


Diamond Products Heavy Duty Orange Bits
Excellent footage and drilling speed. Designed for all types of wet drilling applications with light to moderate steel
$218.80

HOL Spec
General Purpose
Longer Life
Cat # 05079
General Purpose
Longer Life
Cat # 05079

H38F Spec
Med Aggregate
w/ reinforcement
Cat # 45572
Med Aggregate
w/ reinforcement
Cat # 45572
H42Z Spec
Hard River Rock
w/ reinforcement
Cat # 58138
Hard River Rock
w/ reinforcement
Cat # 58138

H64L Spec
Asphalt
Block
Cat # 05077
Asphalt
Block
Cat # 05077
Diamond Products Premium Black Bits
Very high diamond concentration. Premium Black gives maximum footage and drilling speed in all types of drilling applications
$258.00

POL Spec
General Purpose
Longer Life
Cat # 05791
General Purpose
Longer Life
Cat # 05791

P38Z Spec
Med Aggregate
w/ reinforcement
Cat # 05784
Med Aggregate
w/ reinforcement
Cat # 05784

P64L Spec
Asphalt
Block
Cat # 05788
Asphalt
Block
Cat # 05788
4-1/4" Turbo (Fast-Cut) Wet Core Bits
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.
$244.95


CBPDT Spec
Hard Concrete - Moderate Steel
Hard Concrete - Moderate Steel

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
$235.60

THOWL Spec
General Purpose
Moderate Steel
Cat # 06902
General Purpose
Moderate Steel
Cat # 06902


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
$249.60


TPOWL Spec
General Purpose - Moderate Steel
Cat # 06977
General Purpose - Moderate Steel
Cat # 06977

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. |