Security Locks Set consists of belt pin, lock & lock wheel (one pair each) Silent function for noiseless operation One-piece belt button made of hardened steel with self-tapping wood thread incl. felt disks for the protection of the instrument paint Extended thread also holds very thick guitar straps to 6 mm Bolts made of stainless steel for minimum wear and thus highest safety New design of the ball for the best feel Lock-wheel with special patent thread and locking screw prevents the locks on the belt from loosening Fully compatible with all existing Schaller Security Locks (without Silent Feature) Surface: Black Chrome