century ck security locks, it consists of a number of pieces of metal matrix linking, rod sets the key to hoist sets pole, key sets are available under the front bar defense the pearl for anti-shedding, key hole internal opened a hole which compatible with the pearl for anti-shedding 當(dāng)鑰匙套桿插入葫蘆型鑰匙孔內(nèi)時(shí),推動(dòng)鑰匙上的推拉滑塊,讓鑰匙套桿上的防脫落珠與鑰匙控內(nèi)的防脫落孔相吻合,徹底避免了因操作不當(dāng)而將鑰匙擰斷或拉斷,大大提高了鏈節(jié)式軟鑰匙的使用壽命。