Durable end cap screw extractor tool for bicycle cranksets - Durable construction: made from 45# carbon steel and heat treated for high hardness; CNC finished surface for reliable performance and long service life. - Versatile application: suitable for installing and removing chainring crank screws, and for M27 self-pulling screw cover installation and removal. - Safe and comfortable: beveled, rounded edge reduces the risk of hand injury during use. - Easy to use: ergonomic design and precise machining provide smooth operation; use with a bicycle crank wrench to install or remove crank bolts and self-extracting screw caps efficiently. - Compatibility and performance: designed for common crankset end cap screws, offering practical, long-lasting functionality for routine maintenance and adjustments. Use scenarios - Routine maintenance: remove and replace worn chainring crank screws or tighten crank bolts with ease. - M27 cap handling: install or remove M27 self-pulling screw covers without damage. - Home or shop service: a reliable tool for regular crankset servicing when you work on bikes at home or in a shop.