What size allen key fits a fender stratocaster (headstock access) truss rod?

Hello! Fender uses a 1/8" ( 3.18mm) hex key for truss rod adjustments. Stewart-MacDonald has a very nice wrench available for this purpose, should you be willing to spend a little more (see a href="http://www.stewmac.com/shop/Truss_rods/Wrenches,_hex_keys/Allen_Truss_Rod_Wrenches.html" rel="nofollow"http://www.stewmac.com/shop/Truss_rods/W…/a ). By the way, the size for the saddle adjustment is a .050 (1.27mm) hex key, since you are having trouble finding tool details (see a href="http://www.fender.com/support/stratocaster.php" rel="nofollow"http://www.fender.com/support/stratocast…/a for adjustment specs). Best regards, Dana