BOX One Alloy Chainring Bolt Kit Black
Box One 7075 Alloy Chainring bolt kits include five 8.5-mm front bolts, five 6-mm front bolts, and five 5-mm rear nuts, so they will fit just about any chainring/crank combination, including those with threaded holes.
(5) 8.5mm front
(5) 6.5mm front
(5) 4mm rear
Material: 7075-T6 Aluminum
Finish: Anodized w/Laser-Etched Graphics
• Thread Pitch: M8x0.75p
• Allen Key: 5mm
• 8.5mm/12mm Male Bolt 
• 6.5mm/12mm Male Bolt 
• 4mm/12mm Female Bolt 
• Slotted Female Bolt 
Compatibility: Any chainring / crank combination including those with threaded holes.
Weight Limit: 45 kg (99 lbs) or less with limitations as per Category 1 of EN 16054:2012 Standard