Timberline 608-116 Quick Release Countersink for No.10 Wood Screw Size by 1/8-Inch Diameter by 3/8-Inch Carbide Tipped Hex Shank 1/4- Inch Hex Shank Design for Quick Release For No.10 Wood Screw Size Cutting Diameter 1/8-Inch, Countersink Diameter 3/8-Inch 1/4-Inch Hex Shank Carbide Tipped, Professional Quality