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The complete product has 7 sets moulds , the body material is 3mm thick high quality steel plate, all parts use 120 tons professional stamping machine to produce, and best quality and durable.
Double-decked protecting rubber: two-layer thickness is 5mm best quality rubber , the total thickness is 10mm , better to prevent the damage of tyres.

Double security :this product operates with the heterogeneous rocking handle ,there is no same kind rocking handle now, especially installs the door lock in the jack place of rocking handle, uses the burglar-proof door and safe cabinet door lock techniques ,but prevented effectively the lock is prized.
Double thorn needle:5cm length hollow steel needle , can be punctured the tire of locked cars when the cars move forcefuuly to prevent the cars move forcefully,
Inner and appearance of product: the inner uses the acid pickling, injection oil, prevention rust processing, exterior uses static electricity to spurt with the high brightness plastics powder.

This lock and chain secures the wheels on a water pump or hydrant on the parade grounds at Fort Baker, Marin Headlands. When I saw the lock from the other side, I hope it would bear a "Property of United States Parks" imprint, but I had to be satisfied with "Best" instead.