5/32" Pilot Dia., 3/32" Shank. Fits 4000 series counterbores.

Package of four (4) 1/4-28 threaded pilot cutters in sizes: #40, #30, #21, and #12. 1/2" diameter. 1/4x28 thread. 3 flute, 100 degrees. Integral (fixed) pilot for cutting accuracy. High speed steel.

#12 Diameter, 1/4-28 thread. Two fluted 100 degree cutter with a 1/2" body diameter. These cutters excel in cutting highly abrasive material such as Kevlar, and other "difficult to machine" materials.

1/2" Diameter. Overall length 1.19". Solid carbide tip for long life. 1/4X28 thread. Fits standard microstops

Aircraft Counterbore, 1/2" Dia., 1/8" 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 #30 Pilot. Fits all 1/4x28 Threaded adapters. Made of hardened high speed steel (HSS).

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).

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

9/16" Dia, 3/16" Pilot Hole. Made of High Speed Steel. Requires AT404 series pilot.

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

Dia. Of cut: 3/32" to 1/4". 1/4" shank. 100 degree cutter. High Speed Steel. The "zero flute" design is a single hole drilled through the head of the cutter, which makes it virtually chatter-free.