• DENTIFIES DRILL BITS SIZES- Helpful when working with older, unmarked drill bits and bits too small to fit diameter markings
• 29 MEASURING HOLES- Identified drill bits from 1mm to 13mm in 0.5 mm increments
• ETCHED MARKINGS- Black graduations to give high contrast and will not wear off
• NO MATH- Shows drill sizes in exact milimeter
• DURABLE- Made from heavy duty, rustproof steel