Super Plastic Plugs 1/2 Inch Pack of 50 To Seal Termite Treatment Drill Holes" Super plastic plugs 1/2 inch - pack of 50 plugs for sealing drilled holes in a solid Surface to prevent the discharge from the hole of fluids or chemicals. Has a tubular shape And has a flat top surface and a tubular side wall from which a plurality of sealing ribs Project to engage the side wall of a drilled hole. The ribs prevent the passage of fluids Or chemicals from the hole. Easy to use plugs when drilling holes through concrete slab