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**Brief Introduction** SDZ18 large‑size rectangular combination folding lock increases segment quantity to expand total unfolded locking length. Conventional folding locks often possess insufficient unfolded span to wrap around thick bollards. SDZ18 delivers enlarged working clearance, enabling locking frames‑plus‑wheels or anchoring complete bicycles onto thick railings and lampposts. Keyless resettable combination, alloy‑steel lock‑blades and frame‑mount bracket

**Brief Introduction** SDZ19 general‑purpose folding lock is a cost‑competitive mass‑volume product for broad‑consumer commuter markets. It combines folding‑lock portability with baseline anti‑theft security. Key‑operated and supplied with frame‑mount bracket. Optimized for mass retail via supermarkets, cross‑border marketplaces and physical accessory shops. Works both as standalone merchandise or primary lock within bundled product sets. Mature supply‑chain

**Brief Introduction** SDZ20 heavy‑duty oversized folding lock represents the high‑end heavy‑duty tier within SENDE folding‑lock portfolio. Lock‑blade thickness, segment dimensions and unfolded working length are comprehensively upgraded to meet European high‑security‑grade standards for high‑power e‑bikes and light electric motorcycles. It preserves folding‑lock compact‑storage merit while achieving heavy‑lock‑level violent‑attack resistance. Once folded, it still fits onto

**Brief Introduction** SDZ21 light‑weight folding lock targets road‑bike and lightweight‑sport‑bicycle users. Weight‑reduction optimization is implemented while preserving baseline anti‑theft performance for daily commuting to lessen riding‑carried load. Compact folded dimension for direct frame‑mount‑bracket attachment. Key‑operated with attractive cost‑efficiency, suitable for sport‑accessory distribution channels and student‑commuter‑oriented large‑volume orders. **Material & Craftsmanship** Weight‑optimized alloy‑steel lock‑segments balancing light‑weight

**Brief Introduction** SDZ22 upgraded UFO‑shape combination folding lock iterates upon proven UFO‑oval‑silhouette combination‑lock baseline, focusing on enhanced sealing for combination dials. It addresses common industry pain points where sand‑dust and rain infiltrate combination gears causing jamming and malfunctions, especially in rainy or sand‑storm‑prone regions. Retaining classic UFO oval appearance, alloy‑steel lock‑segments and keyless resettable combination.