Direct Drop-in compact bass machine heads with threaded bushings for 9/16'' diameter peg holes. Gotoh's Res-O-Lite machine heads are extremely light weight (59.2 grams each) from aluminum alloy to make for a less neck heavy bass. Features a 26:1 Gear Ratio. 4 In Line config, fits many Standard American and Mexican basses. Also the key post can be removed and replaced on opposing side.Come in 4 on a side. Mounting hardware included.