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Fits for most Epiphone electric guitar neck truss rod adjustment, also used to drive bolts and screw which have a 4mm hexagon head socket Made of high quality steel, nickel plated, durable and long-lasting Metric size M4, designed for 4mm(5/32 inch) hexagon head socket Long arm: 53mm(2-3/32 inch), short arm: 23mm(29/32 inch) Package includes: 2pcs allen key wrenches