【MULTI-SIZE】The professional step drill, which can accurately drill holes of different sizes, ranging from 5 mm to 35 mm, can complete the processing of large holes at the same time without changing the drill bit or the positioning hole. 【QUALITY MATERIALS】Classic high-speed steel, titanium coating on the surface, proven performance and durability in drilling holes in plastics, wood, aluminum, copper, stainless steel and many other types of sheet metal. Titanium alloy drill bits are especially suitable for processing copper and aluminum parts / die steel / spring steel / cast iron parts / iron and other metal materials. 【PRECISE POSITIONING DRILL】When pressed on the surface, it produces automatic, high-impact, spring-loaded striking force, and an adjustable hood allows you to adjust the striking force. The knurled surface of the brass body is highly non-slip, providing precise positioning points without worrying about deviations. 【EASY DRILLING】The dual-blade design provides faster,