AUTOTOOLHOME 3/8" Replacement Twist Step Drill Bit with Depth Stop Collar 6.5&ldquo; Length for Manual Pocket Hole Jig Master System drill guide for pocket holes.work well with the Manual Pocket Hole Jig Master System, or alone Small tip includes clearance hole for screw shank Large diameter creates flat-bottomed hole Recommended for use with corded high-rpm drills The shank diamater:3/8"(9.5mm)