Schaller S-Lock Strap Locks are engineered to give players the ultimate in safety, silence, and security, and this version is finished in chrome. Crafted from hardened steel with a unique one-piece strap button design, they ensure your instrument stays exactly where it belongs on your shoulder, eliminating the rattles and risks of traditional strap locks. Triple-security architecture and ergonomic operation let these locks fit straps up to 6mm thick, with a patented Lock-Wheel design that makes installation simple yet secure. High-grade felt washers protect your instrument's finish, and precision-built in Germany, S-Locks are ideal for players who want durable, silent, uncompromising reliability on stage or in the studio. Features Secure strap lock system engineered for maximum safety and silent operation. One-piece hardened steel strap buttons use a maximum-grip thread design for a solid mount. Fits straps up to 6mm thick with an ergonomic, stainless steel locking bolt. Patented Lock-Wheel system uses a triple safety concept for dependable, rattle-free reliability. Includes felt washers that protect your instrument's finish during installation and use. Specs Strap button material: Hardened steel, one-piece construction Finish: Chrome Strap button installation: 3mm (1/8") Allen key Thread size: M (4mm wood thread; optional S 3.5mm, L 4.5mm) Strap compatibility: Up to 6mm thickness Strap hole size: 10mm Locking bolt: Stainless steel, slanted design Lock-Wheel: 3-stage safety system (hand-tighten, 2-hole torque mount, grub screw lock) Washers: High-grade felt Made in: Germany