This is an Origin-8 Alloy Single Ring Chainring Bolt Set. Secure the chainrings for your ride with Origin-8 Chainring Bolts. Made for single chainrings, each set includes 5 male/female bolts to securely connect your chain rings. Note: Photo shows only 4 bolts. This product is a set of 5. Features: Fits single chainring applications Inside height measures 4mm when tightened, 7mm total height Set of 5 male/female bolts Specifications: Bolt Size: M8x6mm Bolt / M8x4mm Material: AL6061 Color: Black