Grover 9 series geared uke tuning machines, nickel plated with black plastic oval buttons. Features a shorter string post and the string hole is .630 in. from the back of the base. 14:1 gear ratio, 13/16 in. (20.65mm) post height, 15/64 in. (6mm) post diameter. Push in bushing dimensions: 23/64 in. (9.1mm) outer diameter, .24 in. (6.1mm) inner diameter. All mounting hardware included.