Schaller S-Locks Black Chrome: In 1981, Schaller developed and patented a new category of product that revolutionized guitar strap connections. Their unique design and functionality have set the standard for strap locks for decades. In 2018, Schaller introduced the next generation of revolutionary locks: The S-Locks, with S for save, S for silent, and S for Schaller strap locks. These new S-Locks are silent and feature one-piece hardened steel buttons, an aesthetic design, perfect handling, and an elegant Lock-Wheel, addressing all previous issues. Each S-Lock consists of 3 pieces. Strap Button: The new solid button features a self-tapping wood thread, easily screwed in with a 3mm Allen key. The new Lock-Wheel offers a unique 3-step security function: 1. Screw the lock wheel with its patented self-locking thread on by hand, tool-free. The round shaping should face the pull-up ball for sufficient guitar protection. 2. Use a 2mm or 5/64" Allen key or screwdriver to tighten for maximum security. 3. Attach the micro cone-top screw permanently; you will never lose your wheel again. Assembly and Performance: Put all parts together and listen carefully. Give it a shake, give it a roll, and prepare to be amazed by its silent, noiseless performance during movement and playing. Packaging and Compatibility: All S-Locks come in an attractive, reusable crystal box. S-Locks are fully compatible with all existing Schaller Security Locks. Use one strap and one pair of S-Locks for all your guitars. Enjoy the benefits of the new S-Locks with a single strap; simply use the new strap button replacement kits for all your instruments. The 4mm/5/32" screws with self-tapping wood thread fit all existing strap buttons, including Gibson models, for perfect replacement without adjustments to existing holes or screws. Hardened steel and more than double the thickness of the strap button guarantee maximum security against breakage. High-grade felt washers provide ultimate protection for the guitar's finish. The extended thread length accommodates straps up to 6mm thick. The newly designed slanted locking bolt in stainless steel ensures permanent precision, reliable performance, and a wear-free finish. The newly designed pull-up ball allows for easy-grip locking and release.