set2: 6 * Machine Heads +6 * Mounting screws +6 * Ferrules +6 * Threaded sockets & 2 * end pins +2 * screws +2 * cushions Suitable for most guitars Easy to install, convenient to use Each guitar needs two strap locks Set of 6 sealed machine heads(3L + 3R). Compatible with electric or acoustic guitar. With robust internal gear. Material: zinc alloy/copper These black oil plated strap locks replace your original strap locks without any guitar modification and attach to your strap and snap securely into locking position. Installation Steps: Screw in the pin on the guitar Make sure the pin is tightened, then lock the strap to the straplock button Insert the straplock into the fastening nut Color:Black Package List: 6 * Machine Heads 6 * Mounting screws 6 * Ferrules 6 * Threaded sockets 2 * end pins 2 * screws 2 * cushions Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.