handle adjustable clamping lever threads push button ratchet male threaded stud adjustment die cast zinc universal pull-up spring knobs pop

1.most common size:bikes 8mm,10mm,12mm16 knob for most bikes with metric system. 2.widely used: wide range of applications for exercise bikes, strength equipment, fitness equipment, some weight benches etc. 3.quick release:the knob comes with built-in spring handle, will not scratch your hands due to winding. 4.easy to use:easy to use and quick to install, and will not take up much of your time, very convenient. 5.better pull pin spring knob:built to strict quality control standards, design improved for