CHAIN RING FIXING BOLTS 5 PIECE SET TRIPLE CHAIN WHEELS 16mm x 10mm SHOULDERFULL SET OF5 CHAIN RING BOLTS SUITABLE FOR TRIPLE CHAINSETS WITH DETACHABLE RINGSTHESE ATTACH THE CHAIN RINGS TO THE CRANK ( PEDAL ARM ) ON CHAIN WHEELS WITH DETACHABLE RINGSTHESE SPECIAL BOLTS/ NUTS ARE TO FIT A M10 (9.9mm) CHAINRING AND HAVE A BEARING SHOULDER OF 16mm DEPTHCHROME PLATED STEEL M8 THREAD BOLT WITH 0.75mm THREADSTEEL FINISH NUT (9.8mm nominal) FOR M10 HOLE WITH A 16mm SHOULDER DEPTHTHESE COME IN A VERY NEAT HANDY PLASTIC CASE , WHICH IS IDEAL TO KEEP THEM IN IF YOU ONLY USE ONE OR TWO AT A TIMEIF YOU REQUIRE SMALLER SHOULDER BOLTS FOR BMX OR SINGLE RINGS PLEASE CHECK OUR SHOP LISTING OR ASK USCA140D