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.