#40 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

Aircraft Counterbore, 27/32" Dia., 3/16" Pilot Hole, 2-3/4" Len. Made of High Speed Steel. Requires 1400P series pilot.

3/8" Diameter 100 degree, 3 flute, countersink cutter with integral #21 Pilot. Fits all 1/4x28 Threaded adapters. Made of hardened high speed steel (HSS).

Aircraft Counterbore, 7/16" Dia., 1/8" Pilot Hole, 2-3/4" Len. Made of High Speed Steel. Requires 1400P series pilot.

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

Aircraft Counterbore, 11/16" Dia., 3/16" Pilot Hole, 2-3/4" Len. Made of High Speed Steel. Requires 1400P series pilot.

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

7/16" Diameter. Overall length 1.19". Solid carbide tip for long life. 1/4X28 thread. Fits standard microstops

#12 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. Suit

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

5/16" Dia, 1/8" Pilot Hole. Made of High Speed Steel. Requires AT404 series pilot.

#10 Pilot Dia., 3/32" Shank. Fits 4000 series counterbores.