FT-21X Throttle Feature: Long life, high-quality ABS material, compatible with electric bicycles, scooters, and more. Universal compatibility: Works with 12–72V electric bikes. Suitable for hub motors, BBS01, BBS02, TSDZ, MXUS, and other e-bike hub motor controllers. Two types of wire connectors: Includes standard connector and waterproof connector; compatible with standard brushless DC controllers and KT controllers. Finger throttle: Easy to install and smooth operation; fits electric bikes, electric bicycles, mountain bikes, and folding e-bikes/scooters with 22mm handlebar tubes. Wire length: 150 cm (59 inches); handlebar tube diameter: 22 mm; color: black; wiring: 3-wire with SM-3Y plug or waterproof connector. Color: Black + red Material: Metal + plastic Package includes: 1 × FT-21X throttle Note: Colors may vary slightly due to monitor and lighting differences. Measurement tolerance: ±1–3 cm.