Ko-ken RS3129/6-L60 3/8 Sq. Dr. Bolt Twister Set, 2mm-10mm. This 6-piece set is specifically designed for the removal of broken bolts with missing or damaged heads. Each socket in the set, sized 2mm, 3mm, 4mm, 6mm, 8mm, and 10mm features a 60mm length, allowing deeper engagement for better grip. To use, drill a hole in the center of the broken bolt, insert the bolt twister, and turn left until it grips the bolt firmly, then continue turning to remove it. The set is mounted on a 150mm rail for organized storage and easy access, and operates with a 3/8" drive for versatile use.