These new revolutionary S-Locks are silent. They feature an elegant Lock-Wheel, one-piece hardened steel strap buttons, aesthetic design, perfect handling and all former hiccups have been tackled! Features New and unique solid one-piece strap button in hardened steel with self-tapping wood thread. Simply screw it on with an Allen key (size 3 mm). 4 mm/ 5/32“ screw with self-tapping wood thread. Fits all existing strap buttons incl. Gibson for perfect replacement without adjustments on existing holes and screws. Hardened steel and more than double thickness of the strap button guarantees maximum security against breakage Including high-grade felt washers for ultimate protection of guitar’s finish. Extended thread length for holding straps of up to 6 mm thickness. New designed slanted locking bolt in stainless steel for permanent precision, reliable performance and wear-free finish. New designed pull-up ball for easy-grip lock and release. • MFSKU 447 • UPC 4036641330325