SRAM/Truvativ Chainring Bolt Set. Features: DualHex kits: 5mm-broach bolts with 6mm-broach nuts for secure 2-wrench assembly Triple kit can be used on 5-arm or 4-arm mountain/road cranks (includes 5 inner chainring bolts in addition to middle/outer bolt/nut set) Double kits designed for 5-arm road crank applications (steel kit includes washers) XX/X0/X9/X7 versions do not use nuts due to direct-thread design into outer chainring and inner spider interface Specs: Model:Dual-Hex Kit:single, 8pc Size:8.5x7mm, 8.5x5mm Material:steel Color:black Remarks:Includes 4, 2mm spacers