IDT1646 Features: Drill bit Zirconium coating reduces wear for a longer tool life Premium high speed steel Designed to cut through thin hard metals 12 Step cuts holes from 3/16'' to 7/8'', 1/8'' step depth 3/8'' Shanks fit all popular drills For cutting ferrous and non-ferrous metals, plastics and wood Dimensions: Dimensions: 1'' H x 4'' ...