Description This is a set of 5 step drill bits. Made of high speed steel with titanium coating, I features high hardness, rustproof, solid and great durability. Suitable to cut holes in a variety of material like plastic, aluminum, copper, stainless steel, aluminum plate, insulation boards, and PVC sheet, ect. Feature - Color:Black - Material: high-speed steel+Titanium - Made of high speed steel with titanium coating, high hardness, rustproof, solid and durable - This all-in-one step drill bit is made of super strong HSS steel and is titanium nitride coated for added durability - Increases cutting speed with self-centering and prevents walking. Clears chips faster and allows particles to escape easily - Suitable to cut holes in a variety of material like plastic, aluminum, copper, stainless steel, aluminum plate, insulation boards, and PVC sheet, ect Package Including 5x Step Drill Bit 1 x Aluminum Case