Includes a convenient tray with 100 each of the 1/4", 5/16", and 3/8" size plugs, plus three sample Allen bolts with plugs installed as sales tools These won't fall out or come loose like plastic or aluminum with O-rings Fit tightly and add that special finishing touch to the top of an Allen bolt Made in the U.S.A.. SOCKET HD PLUG ASSORT TRY