Lock machines and cylinders are indispensible of door handles, door handles can’t operate properly without them. We have different material of lock machines and cylinders. There are iron, stainless steel, and brass of lock machines, the size often is 85*45,58*45,50*47mm and so on . And zinc alloy and brass of cylinders, different size: such as 60mm, 70mm, 80mm ,etc.