BRAND | FORM ROLL |
STYLE | Circular Pitch |
TOOTH PATTERN | Right Hand |
TOOL MATERIAL | High Speed Steel |
DIAMETER | 1/2″ |
PITCH | 30 |
WIDTH | 3/16″ |
HOLE SIZE | 3/16″ |
FINISH COATING | Lapped Tooth Finish |
HARDNESS | 58 to 60 RC |
NORMAL CIRCULAR TPI | 30 |
WHEEL DIAMETER | 3/16″ |
SERIES | EP |

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90° 35TPI Spiral Knurl Pair
BRAND FORM ROLL STYLE Circular Pitch TOOTH PATTERN Right & Left Hand Pair TOOL MATERIAL High Speed Steel DIAMETER 1/2″ PITCH 35 WIDTH 3/16″ HOLE SIZE 3/16″ FINISH COATING Lapped Tooth Finish HARDNESS 58 to 60 RC NORMAL CIRCULAR TPI … Continued


90° 40TPI Right Hand Spiral Knurl
BRAND FORM ROLL STYLE Circular Pitch TOOTH PATTERN Right Hand TOOL MATERIAL High Speed Steel DIAMETER 1/2″ PITCH 40 WIDTH 3/16″ HOLE SIZE 3/16″ FINISH COATING Lapped Tooth Finish HARDNESS 58 to 60 RC NORMAL CIRCULAR TPI 40 WHEEL DIAMETER … Continued


3-piece Center Drill Set
Center drills are essential for accurately drilling starter holes in the ends of workpieces, particularly when mounting stock between centers on a lathe. Each drill creates a small pilot hole followed by a 60° countersink, which provides a seating surface for the 60° point of the lathe center.
In milling applications, center drills are commonly used to start holes precisely. The exact hole location can be dialed in using the mill’s calibrated handwheels, and the center drill ensures the hole begins accurately without drifting.
This set includes three double-ended, high-speed steel (HSS) center drills:
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#1 drill: 1/8" shank
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#2 drill: 3/16" shank
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#3 drill: 1/4" shank
The larger shank diameter of a center drill ensures the tip remains centered, reducing the risk of the drill "walking" as the hole is started. After the center drill has established the starter hole, it is replaced with a standard drill bit to complete the hole to the desired diameter.
⚠️ CAUTION: Always use a suitable cutting lubricant and back the drill out frequently during use. This prevents the delicate tip from overheating or breaking off.


90° 40TPI Left Hand Spiral Knurl
BRAND FORM ROLL STYLE Circular Pitch TOOTH PATTERN Left Hand TOOL MATERIAL High Speed Steel DIAMETER 1/2″ PITCH 40 WIDTH 3/16″ HOLE SIZE 3/16″ FINISH COATING Lapped Tooth Finish HARDNESS 58 to 60 RC NORMAL CIRCULAR TPI 40 WHEEL DIAMETER … Continued