●Ideal for converting your vintage style machine heads with 6mm (15/64 inch) string post to a modern 3/8 inch or 10mm peg hole ●Inner diameter: 6.2mm (1/4 inch), outside diameter: 10.2mm (13/32 inch), height: 8mm (5/16 inch) ●Made of zinc alloy, stable and durable ●Traditional looking, excellent product process ensure the edge of the smooth and structured ●Package included: 6 pieces bushings