Drills holes for the screw shank and the thread, in one pass ! Using a Taper Point drill and a Countersink enable 3 operations in one pass ! Drill, countersink and counterbore.
Tapered Pilot Holes for wood screws are recommended especially for hardwoods. The hole in the first piece of wood is drilled large enough for accommodate the screw shank. In the second piece of wood, the hole is perfectly tapered to fit the screw thread.
Tapered drill bits are milled from solid high speed for long life. Highly polished flute surfaces for easy chip ejection. Cutting edges have back relief for smooth drilling with less friction. Special tip grinding for precise centering and penetration.
Drill diameter : 3/32"
Couterbore Diameter: 3/8"
For screw # 3 ; 4; 5