CHROME 5/16 ALLEN HOLE PLUGS. PACK OF 100.
Source: Custom Chrome
The ideal way to complement the sockethead screws that fasten most of the gear, transmission and primary covers to your engine. They re simply pressed into place in the head of the screw, and are available in bulk packs, or an assortment which contains plugs to fit 1/4", 5/16" and 3/8" sockethead screws.