Eazypower 81395 2-Inch Get It Out One Way/Rounded Screw Remover Removes stripped or broken screws or bolts Strong enough to drill into hardened bolts Handy storage case #16 one way screw/rounded bolt remover/installer fits 21/32 inch (.669in. 16.95mm) diameter screws Patented one way screw remover/installer is eazy as 1, 2, 3. 1. Loosen set screw to adjust tip depth. 2. Align and seat tip into screw head/bolt. slide collar flush with surface, tighten set screw. 3. Apply pressure while removing or installing one way screw or rounded bolt.