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.

Rear bolts are slotted for ease of installation. 

Specifications: 

• Material: CNC-Turned 7075-T6 Aluminium
• Finish: Anodized w/Laser-Etched Graphics
• Thread Pitch:M8 x 0.75p
• Allen Key: 5mm
• 5mm/12mm Male Bolt [5]
• 5mm/12mm Male Bolt [5]
• 4mm/12mm slotted Female Bolt [5]
• Compatibility: Any chainring /crank combination including those with threaded holes.
• Weight: 7g
  
  Weight Limit: 45 kg (99 lbs) or less with limitations as per Category 1 of EN 16054:2012 Standard