Review on RocRide Narrow Chainring Speed Bolts by John Lewis

3 stars as this only fits on the outer chainring on most Shimano/Sram cranks you will need to grind some metal evenly around the edges at the base of the bolts to match up, now on the other hand i have a saint and a zee crank which oddly uses that particular diameter inside, i've always had a gap with my 32 tooth sprocket- Wolf and would prefer full ring contact without relying 100% on bolts, that fits nicely in a Saint/Zee crank, you can try there. But a word of warning for most other setups, this will only work in the extreme position on the 3-ring crank and it will disable your chainline.