Nut Washer Kit Instrument Socket Connector Fasteners for Electric Guitar Bass M9 Female silver.Feature: 1. [SPECIFICATIONS] Including 14pcs nuts and 14pcs washers, sufficient in quantity, easy to use and replace. 2. [M9 THREAD] These nuts have standard M9 female thread, a pitch of 0.75mm, and a standard size. 3. [SMOOTH SURFACE] The surface of these nuts and washers is smooth and seamless, tightly connected and not easy to slip. 4. [FOR JACK CONNECTION] Commonly used for electric bass or guitar,