Inton 3/8" Replacement Twist Step Drill Bit with Depth Stop Collar 6.5" Length for Kreg Manual Pocket Hole Jig Master System The shank size:3/8"(9.5mm) Drill guide for Kreg manual pocket holes,very sharp Small tip includes clearance hole for screw shank Large diameter creates flat-bottomed hole Recommended for use with corded high-rpm drills