AccusizeTools - Metric H.S.S. Solid Cap Screw Counterbore Set, 3 Flute, Straight Shank, 7 Pcs/Set, #508S-007M
HHIP 2007-0002 7 Piece HSS 3 Flute Solid Pilot Counterbore Set
HHIP 2007-0105 1/4 x 3/8 HSS 2 Flute Solid Cap Screw Counterbore
HHIP 2007-0040 40 Piece HSS Straight-Shank Counterbore Set, 1/4-1 Inch