Slider: Slider (拉头)
The moving component that rides along the teeth and forces them together or apart. Its channel, guide posts and locking mechanism govern pull feel, self-locking reliability and resistance to pull-off. Sliders are die cast from zinc alloy or moulded from engineering plastic, then assembled with a bridge, spring and puller. The slider size must match the gauge of the chain; a mismatch causes drag, jamming or accidental opening.