This set of 2 Schaller Buttons for S-Locks Classic has the original Security Locks style button that requires a separate screw to mount the button to the guitar (as opposed to the new S-Locks style button which has the screw built into as one solid piece).

The S-Lock Classic buttons are available as spares so you can use one strap equipped with Schaller strap locks across multiple guitars with S-Lock buttons installed. Set of two buttons come with felt washers to protect the guitars finish, the button mounting screws are not included. We stock the standard S-Lock strap locks with the solid one piece button and mounting screw as a separate item.