I see a lot of guitars where the tailpiece has been damaged by use of an incorrectly sized screwdriver (or coin!). Sometimes too the top has been damaged when the screwdriver has slipped.

The Stop Tailpiece Wrench has a thick screwdriver tip recessed into a smooth-walled socket that fits the 1/2" (12.70mm) diameter tailpiece stud snugly. The socket keeps the wrench centred, to protect the stud's plating and avoid accidents that could mar the guitar top. Made of tool steel, with a durable plastic handle.

Custom made in the USA. Overall length is 7-3/4" (196.85mm). Inside diameter of the socket is 17/32" (13.49mm). This tool will work on tailpiece studs with 17/32" (13.49mm) maximum diameter.