Grover 8 series geared uke tuning machines, nickel plated with nickel oval buttons. Features a shorter string post and the string hole is .775" from the back of the base. 14:1 gear ratio, 1" (25.4mm) post height, 15/64" (6mm) post diameter. Push in bushing dimensions: 23/64" (9.1mm) outer diameter, .24" (6.1mm) inner diameter. All mounting hardware included.