The bits are designed to bore out the center of the damaged screw or bolt. It can be used to remove rusted, damaged or stripped screws and bolts. To use; center the extractor bit in the screw head and turn counter-clockwise to loosen. For broken off screw shafts or bolts then you will need to drill a starter hole in the center before using the extractor bit so that the extractor has something to grab on to.
Made of Tempered Chrome Vanadium Steel for longer life and durability
Anti-clockwise twist design
Plastic reusable carrying/storage case included.
Designed to remove stubborn, rusted, stripped, screws or bolts.
Material: Chrome Vanadium Steel
Each bit is for sizes 1/8-1/4"(3-6mm), 1/4-5/16"(6-8mm), 5/16-7/16"(8-11mm), 7/16-9/16"(11-14mm), or 9/16-3/4" (14-18mm)