Black Rapid Underarm Stabilizer for Strap RS1, RS5, RS7 Designed to Attach to your Black Rapid Strap for a More Secure Fit During those Action Packed Shoots This Patent-Pending Piece of Equipment Offers Unparalleled Ease of Access to your Camera and Peace of Mind Compatible with the Black Rapid RS-1, RS-5, RS-7 1 Year Warranty