You can use these to drill holes in any materials. Work with plastic, wood and most metals such as steel, brass, aluminum and copper.
The shafts are so small that they should fit into a standard size chuck. The drills consist of forged, heat treated and polished, classic high-speed steel with titanium coating for proven performance and durability.
A MUST for every household and every workshop!
✨HSS STEEL CONSTRUCTION:High speed steel construction for longer cutting edge life, even at extreme temperatures. ✨TITANIUM COATING:This titanium-coated step drill bit provides good resistance to heat, corrosion and rust. ✨AUTOMATIC CENTER PUNCH:Provides an automatic, impact-resistant, spring-loaded impact when pressed against the surface. The adjustable cap regulates the impact force. ✨28 SIZE FOR SINGLE DRILLS ：This kit contains three standard step drills that replace 28 single drills. ✨A MUST FOR HANDYMAN OR PROFESSIONALS:Perfect for home repairs and light work such as drilling holes in plastic, aluminum, copper, sheet iron and many other types of sheet metal (except steel or other harder metals).
4-20 mm - 4, 6, 8, 10, 12 mm (5-step drill bit)
4-22 mm - 4, 6, 8, 10, 12, 14, 16, 18, 20 mm (9-step drill bit)
3-32 mm - 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 mm (10-stage drill bit)