Material and construction - Made from 45# high carbon steel, heat treated and CNC machined for superior hardness, precision, and safety. - Edges are beveled and rounded to prevent hand injuries during use. Function and compatibility - Bicycle crankset end cap screw extractor tool designed specifically for installing and removing chainring crank bolts and M27 self-tightening screw covers on bicycles. Practical specifications - Weight: approximately 72 g, offering a lightweight and easy-to-carry solution for toolkit or on-bike use. Benefits and performance - Durable, high-precision tool built for reliable performance in routine maintenance and repairs. - Beveled and rounded edges minimize the risk of hand injury and tool damage during installation or removal tasks. Use scenarios - Home workshop or bike garage: convenient for routinely installing or removing chainring crank bolts and handling M27 screw covers on various bicycle cranksets. - On-the-road or at the trailhead: compact and portable for quick, reliable crank bolt or cap work during repairs away from the workshop. - Professional bike shop: a dependable, precise tool for technicians to service multiple bikes with chainring bolts and M27 end caps efficiently.