Shpwfbe Organization And Storage Sets Shank Bit Multiple 3Pcs High Hole Step Steel Speed Hex Drill Step Drill Tool&Home Improvment

Different sized shanks ensure compatibility with 4-12/4-20/4-32mm chuck sizes. High speed steel step Drill Bit Set provides fast and smooth drills on steel sheets aluminum sheets wood board board etc. (the board must be smaller in thickness than the height of step drill bits). All drill bits come in special bag for easy transport and storage. Before use，please mark the that you are to drill for easier drilling and improved drill bits life. Material: high speed steel4241 Specifications: 4-32 4-20 4-12 3x step drill Weight: 248g Hex shank size: 6.35MM