These HSS (high-speed steel) countersink step drills are ideal for countersinking flat head screws or bolts in wood, plastic, and soft metals. These step drills allow you to drill and countersink in one operation and are less likely to clog that 2-piece countersinks especially in aluminum. The countersink angle on all bits is 82 degrees. The shank diameter on screw sizes 2-4 is the same as the large diameter. Screw sizes 5-8 have a 1/4 inch shank diameter, screw sizes 9 and 10 have a 3/8 inch shank diameter, and larger sizes above that have a 1/2 inch shank diameter. Special sizes and countersink angles are available upon request. Legend below explains sizing. Select your item(s) then click Add to Cart.
Legend (in inches unless otherwise noted):
- SS = Screw Size
- LD = Large Diameter
- SD = Small Diameter
- PL = Pilot Length
- FL = Flute Length
Technical InfoW.L. Fuller Inc. is a family owned, third generation, manufacturer of the best countersinks, counterbores, plug cutters, taper point drills, brad-point drills, and step drills. They have over 60 years of experience in manufacturing tools to cut woods, plastics, and metals.
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