Race Face Cinch Hex Adapter Tool Yes, your 8mm hex tool will work with a 16mm cinch bolt and puller cap, as long as you use the Race Face Cinch Hex Adapter Tool. Easy-peasy, it's a 8mm to 16mm adapter. Race Face Cinch Hex Adapter Tool Specifications: Requires: 8mm hex tool Fits: Cinch Manufacture Part #: D30351 | Race Face | Cinch Hex Adapter Tool 16Mm To 8Mm Hex Adapter