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Contact SupplierThe pin tumbler lock is a lock mechanism that uses pins of varying lengths to prevent the lock from opening without the correct key.the the outer casing  of the pin tumbler has a cylindrical hole in which the plug or metal pin is housed. The lock mechanism uses pins of varying lengths to prevent the lock from opening. To open the lock, the plug must rotate, this is done by using the correct key.the 5 cylinder slots that are set close together in a line. A metal pin, or "tumbler", fits closely to the walls of each of the slots. A second metal pin, or "driver," sits above the tumbler and is pushed down on the tumbler by a very small coil spring, which is permanently compressed as it sits inside the lock's enclosed case.when key is inserted into the lock, the key pushes the bottom pins into the right position, which allows the user to turn the key and unlock the lock. Cy301  with 30 ° cam,   cy302  with  0 ° cam 1.    5 rounded-head picking proof  pins will be 59049 combination 2.   spool counter pins resistant to attack. 3.   master key or key alike are available 4.   finish:   01-brass polished with varnish   02-bright nickel plated   03-satin nickel plated l a b pins finish qty/box 54 27 27 4 01,02,03 12 56 28 28 5 01,02,03 12 61 28 33 5 01,02,03 12 66 28 38 5 01,02,03 12 60 30 30 5 01,02,03 12 65 30 35 5 01,02,03 12 70 3