5/8 hex key cheap on ebay
just bought 2 of these on ebay. the chesco stuff is new old stock. will sell the other to a co worker. these are for truvativ/sram self extracting caps. the cap likes to fall out on occasion when removing the cranks. http://cgi.ebay.com/Chesco-5-8-Long-...item1e57f1da07
Fractional inch tools on a Metric dominated machine?
i believe the difference is only .005 inches. good luck finding a 16mm hex key, they are available but not readily. anyways sram even lists a 5/8 as acceptable. the hex key is much easier to use than the head of 1/2 bolt that i was using