Material: Metal, Suitable for: Mountain Bike. Tool No. 1: Bicycle Chain Remover, 3-in-1 functionality, sprocket whip wrench, hook lock ring tool and bottom bracket assembly tool in one!, Size: 20.1 * 6.8 cm. Tool No. 2: Bicycle Freewheel Cassette Remover, Size: 2.7 * 2.6 cm. Tool No. 3: Bicycle Bottom Bracket Remover, Size: 5 * 3.2 cm. Tool No. 4: Bicycle Crank Remover, 7.6 * 1.9 cm.