Bizsugar Win - Master The Art Of Auto Locksmiths Near Me With These 8 Tips Tension wrenches are used to allow pressure to be used to along side it of a cylinder lock key slot in order to allow pins to slide correctly in the shear the queue. Basically this tool allows the free use of both of one's hands as an alternative to just one while one other applies turning pressure (the tension wrench keeps a comfortable pressure at the shear line instead of your hand). Tue, 21 Sep 2021 13:23:58 UTC en