4 to 12mm / 9 Step Drill Bit

This handy 4-12mm 9 step drill bits allows you to drill different sized holes in plastic, wood or metal without changing drill bits. Heat treatment and titanium nitride coating increases the hardness and makes the bits last up to 4-5 times longer than ordinary drill bits.

Features

• Self starting tips will not skid – No need for centre punch or pilot drill.
• Designed to auto de-burr the hole cut.
• For use on electric drills and drill presses.
• Hex shank will not spin inside the chuck.