IKN Set of Chrome Bass Big 2L2R Machine Heads Tuning Pegs Open Vintage Open Machine Heads for 4 Strings Electric Bass Guitar Parts Replacement. Heavy duty internal gear.Location: 2pcs Right & 2pcs Left. Button :half moon plum button, approx. 40.3mm width.Headstock Shaft: approx. 14mm diameter. Material: Metal;Color: Chrome. Package Included:4 x Machine head(2R2L),4 x Ferrule,16 x Screw.