3/4" Dia, 1/4" Pilot Hole. Made of High Speed Steel. Requires AT404 series pilot.

3/8" Diameter 100 degree, 3 flute, countersink cutter with integral #12 Pilot. Fits all 1/4x28 Threaded adapters. Made of hardened high speed steel (HSS).

Package of four (4) 1/4-28 Threaded Pilot Cuttes in sizes: #40, #30, #21, and #12. 3/8" Diameter 100 degree, 3 flute, countersink cutter. Fits all 1/4x28 Threaded adapters. Made of hardened high speed steel (HSS).

3/8" Dia., 3/32" Pilot Hole, 2-3/8" Len. Made of High Speed Steel. Requires 1400P series pilot.

#21 Diameter, 1/4-28 thread. The unique "high-hook" design of these countersink cutters allows smooth, easy cuts with virtually no chatter. Body diameter is 1/2. They will fit into a stop countersink or they can be used directly with an angle drill. Suita

9/32" Pilot Dia., 1/8" Shank. Fits 4000 series counterbores.

1/4" Dia., (For AT402 & AT403)

3/4" Dia, 5/16" Pilot Hole. Made of High Speed Steel. Requires AT404 series pilot.

7/8" Dia, 3/8" Pilot Hole. Made of High Speed Steel. Requires AT404 series pilot.

1/4" Pilot, 1/2" Diameter. 1/4x28 Thread. 3 flute, 100 degrees. Integral (fixed) pilot for cutting accuracy. High Speed Steel.

#33 Pilot, 1/2" Diameter. 1/4x28 Thread. 3 flute, 100 degrees. Integral (fixed) pilot for cutting accuracy. High Speed Steel.

15/32" Pilot Dia., 3/16" Shank. Fits 4000 series counterbores.