DESC: The greatly improved GK-3 is 30% thinner than the older version, and a cinch to install. It includes an adjustable curve design to keep an even distance between the strings for better response and a brilliant attachment plate that lets the GK mount right to the bridge screws of Les Paul style guitars. The guitar connection is 1/4 in. to 1/4 in., and the pick up wire retracts for a neat installation.