Snappy Tungsten Carbide Tipped Countersinks, 5 Pc Set Drive Shank: 1/4? Hex Power Bit Shank (5) TCT (Tungsten Carbide Tipped) Countersinks: 5/64?x3/8?, 3/32?x3/8?, 7/64?x3/8?, 1/8?x3/8? & 9/64?x1/2? (1) 1/8? Hex Key