DeWALT® Rotary File, Conical Radius End, series: HP™, Specifications: Fine Diamond Cut Tooth Style, 1/2 in dia Cutting, 1/4 in dia Shank, Steel. DeWALT® DWA4971 HP™ Conical Radius End Rotary File, Fine Diamond Cut Tooth Style, 1/2 in dia Cutting, 1/4 in dia Shank, Steel