Use this tool to easily hold cylinders you are rekeying. The BROCKHAGE® Pin Checking Cylinder Holder can be used to check the length of pins you are inserting in a cylinder. The diameter of the holder is set to be the same as most commonly used residential locks in use today. By turning the cylinder after inserting each pin, you will be able to double check making sure each pin isn't too long. The holder features an extension that allows it to be used with most any vise. Easily and quickly insert re-pin and remove each cylinder with this convenient tool.