These freewheels are designed to be used with left-hand threaded hubs for left-side drivetrains. Intended for Left Hand Drive use only. Uses traditional BMX 4-prong freewheel remover. Item Specifications: Color: Gun Metal, Weight: 181, Cassette Body Type: Threaded 1.37" x 24tpi LH, Freewheel Teeth: 20, Chain Compatibility: 3/32",