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if you are a weight weenie then POP do aluminium ones with Torx both sides
and shimano apparently-> http://www.bike-discount.de/en/buy/shimano-chainring-bolts-fc-m985-51583/wg_id-10661
You really need to look at the nuts, there's no point having Torx screws if you still have crappy slotted nuts. Truvativ steel ones with hex both sides are good, if you are a weight weenie then POP do aluminium ones with Torx both sides