These plug cutters produces plugs to exactly fit counterbored holes produced by Ref. 62 & 63 group tools. Cutter should be used at recommended speeds of 1000-20000 RPM. These plug cutters produces plugs to exactly fit counterbored holes produced by Ref. 62 & 63 group tools. Use at recommended speeds of 1000-20000 RPM. Specifications Diameter 12mm Cutting Depth 16mm Shank Diameter 1/4" Body 19mm Wood Screw Size No. 10