Description Strap button 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 3mm/ 1/8"). 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 (XL and S version also available (see below)), 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. Lock 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. Lock-Wheel New Lock-Wheel with unique 3-Step security function: Screw our lock wheel with patented self-locking thread tool-free by hand, you already protect your guitar sufficiently (the round shaping must be facing the pull-up ball!). Use a 2 mm or 5/64’’ Allen key or screwdriver to tighten it for maximum security. Use our micro cone-top screw to attach it permanently. You will never lose your wheel again!