These are nifty little plugs that fit tightly with a chrome finish which doesn't peel. Because they're cast of a polymer I've found that they can be carefully removed and replaced for tightening the handlebar clamp screws many times. Best of all they keep unsightly rust from forming in the Allen screws. I like them.
Handlebar clamp Allen bolts fill up with water and get rusty if they're left uncovered. Enter Custom Chrome's nifty plugs which top the holes, look great and fit well. Being made of a tough polymer they can be gently pried off and replaced when it's necessary to tighten the bars. I wouldn't wash my bike or risk riding it in the rain without them.