Monoprice 108729 Keystone Jack TOSLINK Female to Female Coupler Adapter, White, 1-Pack This keystone jack provides a female S/PDIF Digital Optical (TOSLINK) connection on each side and is The keystone measures 31/32" long by 13/16" tall by 3/4" wide The core receptacle inside is gold-plated Note that our Premium TOSLINK cables will not fit on this keystone