Caplugs 3/8" Flush Plugs for use in plugging Holes in Sheet Metal 3/4" Head 50 Pieces. BPF Series button plugs with flush-type heads can be used for plugging holes in equipment made of sheet metal, such as automobile bodies, tanks, refrigeration units, etc. Can be snapped into holes easily Held in place by a bead until deliberately removed Material: Low-density polyethylene (BPF-5mm, BPF-6mm, BPF-1/4-4 and BPF-11/32 is EVA material) Service Temperature: LDPE: -94 - 175° F (-70 - 79° C) | EVA: -90 - 140° F (-68 - 60° C) Color: Black