Features: One Set with All: 4pcs/set Banjo machine head tuners tuning pegs/key includes 4pcs machine heads and 4pcs bushings and spacer. Material: Excellent quality banjo tuners with pearl buttons; Made of zinc alloy and celluloid. Universal Accessory: Geared tuners to fit most modern and vintage banjos; Includes bushings and nuts. Rust-proof Design: Heavy-duty internal gears and standard sizes rust-proof and high durability these exquisite tuning nails have stamped gear housings. Functions: These guitar tuning pegs are an excellent replacement for old broken tuning pegs and are suitable for almost all acoustic and electric guitars. Specifications: Material:Zinc alloy and Celluloid Color:Chrome the diameter in millimeters of the main body of the tuners:16.5mm includes: 4 x Banjo machine head tuning peg/key 4 x Bushing and spacer "