MELIN HS4D-3/4”-82. 1" Diameter X 82° Single End Drill Point 4 Flute Black Oxide HSS Countersink 1/2"Shank,2-3/4"Oal,4 Flute Single End 4 Flute HSS  Drill Point Countersink, Spot Drill/Countersink In 1 Operation Made In USA.