Produce a Smooth, Round Countersunk Hole Every Time Best Countersink Available for Aluminum Cut Degree is 82° CRL Countersinks were specifically designed to cut round countersunk holes in aluminum. They cut faster than standard countersinks and leave a finished hole every time. Smooth drilling action from single cutting edge prevents chatter and fluted edges. The 1/4 inch (6.4 millimeter) shank diameter fits any 1/4 or 3/8 inch (6.4 or 9.5 millimeter) drill chuck. Hole Size : .486 For No. 2 to 14 Screws Produce Smooth, Round Countersunk Holes Every Time Best Countersink Available for Aluminum Model 18SCS Brand Name CRL Shank Type Round Unit Count 1.0 Count Item Weight 18.14 g Part Number 18SCS Point Style Countersink Point Finish Types Beige Manufacturer C.R. Laurence Material Type Aluminum Item Dimensions 6 x 6 x 6 inches Tool Flute Type tool_flute Cutting Diameter 0.49 Inches Number of Flutes 1 Number of Pieces 1 Included Components 1 Cutting Angle String 82 Degrees Minimum Bore Diameter 0.08 Inches Surface Recommendation Aluminum