Product: Vencetmat 4mm & 5mm Truss Rod Wrench, Allen Wrench Tool Ball End for Martin Acoustic Guitar Truss Rod Adjustment And Deep or Narrow Truss Adjustment.
Brand: VENCETMAT
Color: 4 & 5mm(Black)
What is the most important thing to attention when buying a wrench?
 1.First of all, it must be a very accurate size, non-standard size will bring irreparable damage to the adjusting screw.
 2.Secondly, it must be strong and can be used for a long time. Inferior spanners can only be used for a limited times.
 3.It should have a beautiful appearance. For a tool, function is the most important, but appearance will reflect the technology quality of the manufacturing. 
 
 Yes, all the thing can be found in our spanner:
 Precise.
 Sturdy.
 Beautiful.
 
 A wrench is not worth a penny for an expensive martin guitar. Even so, you can't find the wrench in the original martin guitar's package. 
 Maybe martin company is confident in its own guitars, or they don't recommend that players adjust their guitar neck. 
 Anyway, it's very necessary to have this accessory for every martin players. 
 When you don't like the guitar handle some day, it can help you accomplish something. 
 In short, you won't regret own it. 
 
4&5mm wrench covering most of the acoustic guitar's truss rod adjustment hole. If have no idea about the diameter of hole, we recommend this configuration.

 Martin guitars adjusting hole is deeper than the general guitars. so when inserting a wrench, it needs to be tried many times to fit properly with the screw hole. After loosening the strings, inserting a wrench, clockwise adjusting can make the strings distance lower and counterclockwise adjusting can make reverse. Normally, the strings distance of 12th fret reach about less than 4mm is right.
 
 
 Features: 
 - This hexagonal wrench can be used to adjusted the guitar neck straight. 
 - Fitted for Martin guitar and specialized to the adjusting. 
 
 Specification: 
 Hex Size : 4mm/0.16"; 5mm/0.2" 
 Overall Size : 125 x 75mm / 4.9" x 2.95" 
 
 Package content: 
 1 x 4mm Wrench 
 1 x 5mm Wrench 

For martin or other guitar which couldn't reach it with a regular hex wrench truss rod adjustment.
Two way L-shape truss rod adjustment tool.
Made of carbon steel, durable and highly wear-resistant.
Set for most kinds of acoustic guitar, electric guitar and bass.
For locking hexagonal screws on the bridge, adjusting the guitar neck.

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