These Stainless Bolt Caps are a clever new product from NITTO. They are made to snap-fit into the heads of M5, M6 and, M8 Allen Key head bolts. Once fit, they give a very clean look to parts like stems, seat pins, brakes and even chainrings. Available in M5, M6 or M8 sizing in value-packs of 4, or sold as singles. They have a brushed silver stainless finish. They are a 1-piece machined part, and have 4 little 'claws' that grip the inside of your hex-head (allen) bolt or nut. You can carefully, slightly bend them tighter or looser to get a perfectly snug fit.