The truss rod wrench is made of quality metalLong handle length allows easier access to truss rod cavityFits most (Not All) Gibson guitars as well as other guitars needed wrenchFeatures nut driver on one end and a handy Phillips screwdriver at the otherUsed compatible with tweaking the amount of relief in the neck, suitable compatible with electric guitar replacement partsThe 6.35MM (1 or 4 inch) model is suitable compatible with most Taylor folk guitar series, (not applicable to the brand's classical guitar) (please pay attention to the size data of the long and short models, if you buy the long model, the length may cause the length to stand against the wood. Cannot be inserted into the hole, buying a short one and buying a long one may cause the length to be not enough to be screwed into position)The 7MM model is suitable compatible with some Korean PRS, Nissan Jackson, Taylor Taylor and Nissan Ibanez guitars. Please choose according to the actual size of your own piano (please pay attention to the length and short size data)The 8MM (5 or 16 inch) model is suitable compatible with some American-made Gibson electric guitars and Nissan ESP electric guitars. Please choose according to the actual size of your own piano (please pay attention to the length and short size data)Colour: BlackMaterial: ironSize: 7MM or 8MM or 6.35MMPackage Contents:3 x Guitar Truss Rod WrenchOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.