You Will Get: Package includes 5 pairs of single chainring bolts and nuts. Enough quantity for self-modifying most bicycle single chainring and replacing damaged chainring screws. Size Detail: Nut: 10 mm x 6.5mm; Bolts: 8mm x 9.5mm. Use a 5mm hexagon wrench to install the bike crank arm bolts. Please confirm the size is suitable before buying. Material: The black crankset screws are made of 7075 aluminum alloy, weight approx 1.5g/single, lightweight and stable. The surface has been electrophoretic coated to prevent corrosion and rust, with nice metallic luster. Application: Great accessory for cycling enthusiasts. This chainwheel bolts are suitable for most mountain bikes, road bikes, folding bikes, fixed gear bikes, downhill bikes, track bike, rail bikes, MTB, BMX, DH, etc. Note: Our aluminum alloy bike crank bolts are used for single chainrings/chainwheels. Please be careful not to use excessive force when installing the chainring bolts, otherwise it may break.