YOHOOLYO Step Drill Bit Set 5Pcs HSS Cobalt Drill Bits 50 Sizes Multiple Hole Drill Bit with Aluminum Case[Product Information]- Superior Design: Two flutes design automatically deburrs while drilling; double cutting blades design enables a faster and smoother cutting.
- Good Quality: HSS cobalt ensures extreme durability， will stay new and shiny for years to come
- Shank : Five sizes; tri-flatted shank prevents slip in drill chuck(the board must be smaller in thickness than the height of step drill bits)
- Multiple Sizes: 50 sizes are available， perfect tool set for you. Please mark the spot that you are to drill for easier drilling and improved drill bits life
- Fashionable Case: The delicate and stiff aluminum case will organizes your drills well， easy to transport and storage
