These Switchcraft units are the best quality endpin jacks I can buy. For standard 1/4" jacks. They require a 1/2" (12mm) hole for mounting.

They have 4 connectors (tip, ring, switched earth and earth). May be wired for mono or stereo connection and/or can be used to switch on an onboard preamp. Can be used for a stereo installation AND to switch a battery on.

Nickel plated finish to the strapnut.