Feature: ?Material: zinc alloy. ?Installation diameter 6mm. ?Ratio: Gear Ratio - 1:18 ?Location: 3 left 3 right. Description: ?Open style machine heads,heavy duty internal gear. ?Keep your guitar on tune and easy to tune, the machine heads are perfect Replacement for use on your special build or repair job. ?Can be installed very easily Replacement for newer. Package Includes: ?3 x Right Guitar machine heads ?3 x Left Guitar machine heads ?12 x Screws Warm Tip: ?Due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! ?Kindly check your instrument if this item is suitable for according to the item specifictions before you place the order.