IKN Set of Chrome Tuning Pegs 2L2R Machine Heads Bass Gotoh Style Set of 4pcs(2L2R) Bass Tuning Pegs for Electric Bass Guitar Parts Replacement. Full Sealed Machine Heads,Heavy duty internal gear. Button Size: approx. 33mm width.Headstock Shaft :approx.14mm diameter. Material:Metal.Color:Chrome. Package Including:2 x Left machine heads,2 x Right machine heads,4 x Ferrules,4 x Threaded bushing,4 x Screws