Eazypower 88240 Get It Out One Way/Rounded Screw Remover Set, no.6, no.8, no.10, no.12, no.14, Colors May Vary Includes sizes no.6, no.8, no.10, no.12, no.14, hex key and screwdriver handle with 1/4-Inch bit holder; select size that fits snuggly on one way screw with 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. Apply pressure while removing or installing one way screw or rounded bolt.