RockShox Rear Shock Mounting Hardware-3-Piece Set 1/2" industry standard shock eyelet is compatible for RockShox as well as current Fox, Marzocchi, Cane Creek, Progressive, and any other shock with a 1/2" eyelet. 3-piece kit includes two spacers and one eyelet pin Each bike requires two hardware kits (1 kit per eyelet) Size refers to overall frame mount ID and then by bolt diameter