These are lightweight chainring bolts (crank bolts) for front double/triple chainrings. (For triples, it is used to secure the outer and center rings) If you wish for a different color, please leave a comment. Bolt M8: Total length 9.3mm Nut barrel diameter 10mm: Thickness 8.3mm Please note that if you are attaching the outer chainring and bash guard together, the length will generally be insufficient. The surest way is to remove one of the currently attached bolts and check if the size matches. ※The following are also available in different sizes. For single use Bolt total length 9.3mm Nut thickness 6.4mm Extra long (material differs from this product and is heavy) Bolt total length 16.5mm Nut thickness 13mm Made of AL7075 (super duralumin), it achieves both lightness and strength. If you purchase other items at the same time, we can offer a discount on the shipping difference. We also have various colored parts and consumables like those in the last photo listed, so please take a look if you'd like.