W.L. Fuller C8HT 11/64 Taper Point Drill Bit with Countersink and 1/4 Quick Change Hex Shank 11/64" Drill Diameter for #8 Wood Screws 3/8" Countersink Diameter for 11/64" Drill Hole Diameter Combination Countersink and Hex Shank Taper Point Drill setup