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-Hardened steel shackle and the surface of lock body coated with zinc can avoid the risk of shackle exposure and protect the lock from rust. -Shear Force Test: cut with bolt cutters, calculated by 4 times of lever, with the maximum shear force of 3600LB. -A total of 22 layers of galvanized locks are superimposed and secured through 8 rivets. -Resistance to corrosion:Withstand 24 hours in 1% salt spray (fog) without noticeable oxidation, corrosion and visual changes. -4-pin cylinder prevents picking and the dual locking ball bearings provide resistance against prying and hammering. -High And Low Temperature Test: -23℃ for 2h, then quickly turn to 65℃ for 2h, circulate for 4 times, and the opening and closing functions are normal.







