High quality hardened steel, Chian cutter repair opener tool, Black plated for anti rust. It fits any bicycle chain. Weight : 100 gms approx. Compact design, easy to carry, high hardness and anti-rust, specially designed for quickly and accurately removing or installing bike chain pins. It is ideal for any home bike mechanic for people who want do do it themselves. A necessary tool for outdoor biking. Practical and convenient, gets you out of troubles fast Color