The Fuller #8 Countersink Set contains five type C countersinks for wood screw sizes #6, 8, 10, 12, and 14 with 3/8" and 1/2" cutting diameters. Five matching taper point drills, 3/8" and 1/2" stop collars, 3/8" and 1/2" plug cutters, and two hex keys are all included in a mahogany case. Fuller countersinks will last a lifetime if taken care of. The number 8 is favored by wooden boat builders, woodworkers, and other craftsmen.