Dmax Power 3pcs HSS Step Drill Set.

Material and Coating: The drill bits are made of HSS and feature a Titanium Nitride coating for durability and extended life, allowing for clean, burr-free holes. Set Contents: The set typically includes three drill bits with different size ranges: 4-12mm, 4-20mm, and 4-32mm, allowing for a range of hole sizes with a single bit. Applications: These step drill bits are suitable for drilling holes in various materials, including iron sheets, aluminum sheets, copper, plastic, wood boards, and other types of sheet metal. Features: They often feature a two-fluted design for smoother and faster cutting, and a triangular shank to prevent slippage in the chuck.