4mm and 5mm guitar truss rod wrench with ball end are lengthened, perfect for narrow or deep truss rod likes martin guitar adjustments. Gauge: 1.5mm, 2.0mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, 1/20in, 1/8in, 3/16in. Guitar hex wrench set is made of carbon steel, durable and highly wear-resistant. Various gauges suitable for most guitar screw adjustments. For locking hexagonal screws on the bridge, adjusting the guitar neck. Pipe wrench 6.35MM (1/4 inch) model is suitable for most Taylor folk guitar series, (not suitable for classical guitars of this brand) The pipe wrench 7MM model is suitable for some Korean PRS, Nissan Jackson, Taylor and Nissan Ibanez guitars. Please choose according to the actual size of your piano Pipe wrench 8MM (5/16 inch) model is suitable for some American Gibson electric guitars and Nissan ESP electric guitars colour:black material:metal Package Contents: 1 x 4mm ball wrench 1 x 5mm ball wrench 9 x wrench kit 3 x pipe wrench Only the above package content, other products are not included. Note: Light reflection 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.