This is a standard convex or domed guitar strap button as used in most acoustic guitars at one or both ends of the strap.

Mounts using one screw and felt pad, supplied. 14mm diameter. 

Convex Chrome Plated Strap Button Please email sales@jellyfishaudio.com with a list of items you wish to order and we will send you a link to make a secure Stripe payment. Price: £0.99