【HSS TITANIUM COATING】 - HSS step drill bit made of high quality HSS steel and coated with titanium to reduce friction and heat. Classic high speed steel, titanium surface coating, proven performance and durability when drilling holes in plastic, wood, aluminum, copper, stainless steel and many other types of sheet metal. 【DANCING-FREE DRILLING】 - The self-centering tip and precise cutting edges of the cone drill drill drill into the material without running. Straight chip flutes provide optimal chip ejection!Dimensions: Height 74mm, Handle Diameter: 7mm 【DUAL CUTTING BLADES & THREE-SIDED SHAFT】 - Dual cutting blades and X-port design ensure faster and smoother cutting; 3-sided shank design can prevent the chuck from slipping; With less pressure, the sets cut wood, sheet metal, steel and other surfaces.