This part is manufactured under the standerd of QC/T504-1999 with standard materials. The probalility of cross unlock is low and the release torque is 0.1470.392(N.M) with <9.8N for the force of inserting and pulling out. The waterproof and dust proof and dust proof devices are especially designed with excellent sealing. we and offer all knid of key set, OEM is welcome , so waiting for your inquiry, and welcome you check! certification : QS-9000 : 1998 ISO9001 : 20001) National standard quality guarantee long lasting workinglife time.2) competitive price3) positive customer feedback from oversea and domestic market4) sample purpose order is acceped