Eazypower 88239 Get It Out One Way/Rounded Screw Remover Set, 6, 8, 10, 12, 14 Includes sizes #6, #8, #10, #12, #14 and hex key; select size that fits snuggly on one way screw/rounded bolt. 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.