Eazypower 82681 Spin It Out Damaged Screw Removers, No.0, No.1, No.2, No.3, No.4 Removes stripped or broken screws or bolts Patented design with serrations aggressively bites into damaged screws or drills into broken bolts Sizes include No. 0, No. 1, No. 2, No. 3 and No. 4; use the smallest size that bites into the damaged screw head. put drill in reverse, use slow speed drill or screwdriver. Strong enough to drill into hardened bolts. Handy storage case