This Race Face Steel Chainring Bolt Set includes 4 steel M8 chainring bolts and 4 slotted chainring nuts. 12.5mm chainring bolts are typically used with a double chainring, triple outer chainrings or 1x applications with a bashguard.To install Race Face Chainring Bolts, along with a hex wrench, you will also need a chainring nut wrench. For 2x/3x outer applications M8 bolts 12.5mm long