Made in USA Sizes Included: 5/64" Drill Bit with 3/8" Counterbore Diameter 3/32" Drill Bit with 3/8" Counterbore Diameter 7/64" Drill Bit with 3/8" Counterbore Diameter 1/8" Drill Bit with 3/8" Counterbore Diameter 9/64" Drill Bit with 1/2" Counterbore Diameter Two-Flute Countersink designed for splinter-free holes in wood, plastics & composites Standard HSS drill bit has a 135° split point 1/4" Quick Change Hex Shank Hardened high speed steel material keeps cutting flutes sharper, longer Drill bit length is adjustable to match screw length 2500 RPM Max Includes a 1/8" hex wrench Product Description Specs Insty-Bit Quick Change Pilot Countersink Set. Insty-Bit Two-Flute Countersink & Drill Bit with Quick Change Hex Shank. The 2-flute countersink is designed for splinter-free holes in wood, plastics & composites. The hardened HSS material keeps cutting flutes sharper longer. standard HSS drill bit has a 135 degree split point. Insty-Bit Model 82501. Made in USA. Product Model # Insty-Bit Quick Change Pilot Countersink Set 82501 For California Residents: WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood