Mechanically engineered to ensure ultimate instrument protection, Ernie Ball s Strap Locks feature a push-button, quick-release design, providing a safe, complete 360-degree secure connection to keep your instrument close at hand. Positive locking pins ensure that the locks will not release until the buttons are completely depressed, while the contoured design prevents accidental release. All Ernie Ball Strap Locks are casehardened and steel-plated, making for the most robust and rust-resistant strap lock on the market. Securely fastening buttons mean that Strap Locks can accommodate straps without their own locking mechanisms as well. Each Strap Lock easily installs without any instrument modifications whatsoever. Ernie Ball 4601 Super Locks Black Guitar Straplocks - Secure your Guitar Strap Safely Mechanically engineered to ensure ultimate instrument protection, Ernie Ball s Strap Locks feature a push-button, quick-release design, providing a safe, complete 360-degree secure connection to keep your instrument close at hand. Positive locking pins ensure that the locks will not release until the buttons are completely depressed, while the contoured design prevents accidental release. All Ernie Ball Strap Locks are casehardened and steel-plated, making for the most robust and rust-resistant strap lock on the market. Securely fastening buttons mean that Strap Locks can accommodate straps without their own locking mechanisms as well. Each Strap Lock easily installs without any instrument modifications whatsoever.