Specification Packing: 5 sets (including 5 nuts and 5 washers) Model: Inch rib 3/8inch The nut corresponds to internal thread 9.36mm (0.36 in), thickness: about 2 mm (0.07in) Color: Silver Material: brass nut, iron washer Sturdy, durable, not easy to fade, long service life. Easy to install and use, you can easily complete the operation. Using fine workmanship and exquisite design, the surface is smooth and will not scratch your guitar. Scope of application: suitable jacks for bass guitars.