5/16" Dia, 5/32" Pilot Hole. Made of High Speed Steel. Requires AT404 series pilot.

Aircraft Counterbore, 5/16" Dia., 3/32" Pilot Hole, 2-3/4" Len. Made of High Speed Steel. Requires 1400P series pilot.

.250 Dia., 3/16" Shank. 3 flute countersink. High speed steel. Three flute design. Made of High Speed Steel

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

Carbide tipped for durability making it great for composite work. 1/4” x 28 male thread. Requires 1500P pilot.

3/8" Dia., (For AT402 & AT403)

1/2" Dia, 1/4" Pilot Hole. Made of High Speed Steel. Requires AT404 series pilot.

3/16" Dia., .093 shank. These pilots are used with the 1500 series cutters.

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

7/16" Dia, 5/32" Pilot Hole. Made of High Speed Steel. Requires AT404 series pilot.

On page 9-99 of the RV14 plans, between #6 & #7 there is a NOTE to taper the pilot of a #40 countersink cutter per figure 4 to aid in the countersinking of the holes in the angled trailing edge wedge. We now offer a #40 countersink cutter with the pilot

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