Check the listing for details. Gotoh WRH-1W Allen Wrench Holder with 4 Wrenches. Condition: New. Listed at 11.04 USD. Round Up Your Wrenches Intended to be installed directly onto the back of your guitar’s headstock, the Gotoh Wrench Holder WRH-1W holds all the hex wrenches you need to adjust your tremolo unit. This wrench set includes 1.5mm, 2mm, 2.5mm, and 3mm wrenches locked into a low-profile holder, ensuring your hex wrenches always remain at the ready to loosen your locking nut, remove strings, adjust action, and more. Plus, Sweetwater’s DIY guitarists appreciate how the WRH-1W comes complete with all the screws and washers you need for installation. Perfect for any guitarist rocking a Gotoh double-locking tremolo or any other compatible trem system, the Gotoh Wrench Holder WRH-1W is an easy-to-install upgrade that ensures your tools are never far from reach.