The CMT Forstner Bit - 7/8" Diameter with 3/8" Shank is a precision woodworking bit engineered for drilling clean, flat-bottom holes in softwood. Built from super strength SP steel with a precision-balanced centre point and 2 ground spurs, this right-hand rotation bit delivers accurate, chip-free bores whether you are installing cabinet hinges, fitting shelf pins, or creating oval and arched openings at any angle. The standard rim design provides reliable guidance at this diameter, keeping the bit on track through the full depth of cut.

Key Features

• Super Strength SP Steel Construction - provides durability and long edge retention so the bit maintains sharpness through repeated cuts in softwood without frequent resharpening.
• Precision-Balanced Centre Point - keeps the bit precisely on center during plunge entry, resulting in repeatable flat-bottom holes with no wandering or tear-out at the start of the cut.
• 2 Ground Spurs (V2) - score the wood fiber ahead of the main cutting edges, producing clean bore walls free of splintering or ragged edges - critical for visible joinery and hardware installation.
• Standard Rim Design - provides better guidance for this diameter, keeping the bit stable and on course throughout the bore for accurate hole placement.
• Right-Hand Rotation (RH) - compatible with standard drill presses and handheld drills, making this bit straightforward to use with common workshop equipment.
• 3/8" Shank x 30mm - fits standard 3/8" drill chucks on both drill presses and handheld drills, offering broad machine compatibility without adapters.
• 90mm (3-35/64") Total Length - provides adequate reach for typical hinge pocket and hardware boring depths without excessive overhang.
• Drill at Any Angle - capable of creating oval and arched openings at any angle, expanding design possibilities beyond simple perpendicular holes.

Why This Product

• Flat-bottom holes with clean walls - the combination of the precision-balanced centre point and 2 ground spurs produces the smooth, flat-bottom bores that hinge cups and shelf pin hardware require for a flush, accurate fit.
• Versatile angle capability - unlike twist bits, this Forstner bit can bore oval and arched openings at any angle, making it suitable for decorative woodworking and custom cabinetry in addition to standard hardware installation.
• Reliable guidance at 7/8" diameter - the standard rim design is specifically suited to this 7/8" size, delivering better lateral guidance during the cut compared to rim styles optimized for larger diameters.
• Broad machine compatibility - the 3/8" shank fits a wide range of drill presses and handheld drills, so this bit integrates directly into most existing shop setups without the need for additional tooling.

Specifications

• Manufacturer Part Number: 537.222.31
• Brand: CMT Orange Tools
• Product Type: Forstner Bit
• Diameter: 7/8"
• Total Length: 3-35/64" (90mm)
• Shank: 3/8 x 30mm
• Number of Spurs: 2 (V2)
• Number of Cutting Teeth: 2
• Rim Type: Standard Rim
• Blade Material: Super Strength (SP) Steel
• Rotation: Right-Hand (RH)

Approved Applications

• Drilling precise flat-bottom holes in softwood
• Hinge cup installation and hinge boring
• Shelf pin and hardware drilling
• Cabinet hardware installation
• Creating arched and oval openings at any angle