Replacement Brake KnobExercise bike brake knob assembly, indoor cycling bike stationary exercise bike resistance brake knob assembly. Durable MaterialMade from high quality steel and ABS, it is sturdy and durable. Easy to installThe knob is easy to use and quick to install, comes with a built in spring handle, will not scratch your hands, and it is very convenient. SizesBicycle brake lever total length 24cm/9.45inch(brake lever 21cm/8.27inch), exercise bike resistance knob 4cm/1.57inch. Thread size: diameter 8mm(upper), 6mm(lower). Thread length 4.5cm/1.77inch(upper), 2cm/0.79inch(lower). Package Include1 Piece bicycle brake lever exercise bike resistance bar with resistance adjustment knob. Specification: Material: Metal, ABS Size Chart: Total Length: 24cm/9.45inch Resistance Bar: 21cm/8.27inch Resistance Knob: 4cm/1.57inch Package Includes: 1 PieceExercise Bike Resistance Bar with Adjustment Knob Note: Please allow slightly errors due to manual measurement and different monitors.