Vktech&reg; 5pcs Super Light 7075 T6 Alloy CNC Chain Ring Bolt Road MTB Disct Screws Strong Super light,chainring bolt 8.8g Material: 7075 T6 CNC ANODIZED ALLOY Size: Bolt M8x8.5mm, Nut M8x6.5mm For Shimano and other compatible crankset use Qty: 5 pairs, 5 pair for a pack