High durability and versatilityIndustrial-grade high-speed steel (60HRC) with titanium coating to reduce friction and lower operating temperatures, ensuring long-term wear resistance and durability. 5PCS step drill bits are suitable for most brands of electric drills or bench drills on the market. Easy to store in toolbox or pocket.Precision drillingThe step drill bit features a 118 tip for fast cuts, a 3-flat shank provides fast, precise cuts while preventing feeds and shedding; laser alignment provides precise positioning assistance. The stepper bit features a double-edged design that quickly removes particles and reduces friction and heat for faster, cooler, cleaner drilling performance.packing list: Aluminum box*11/4-1-3/8"*1 piece3/16-7/8"*1 piece1/4-3/4"*1 piece1/8-1/2"*1 piece3/16-1/2"*1 piece