Gotoh Res-O-Lite GB528 Vintage Style Bass Machine Head Set Nickel (4-in-a-line) 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