JB & JBH NEMA 1 Sheet Metal Boxes JB and JBH NEMA 1 Sheet Metal Boxes from Bud Industries are heavy duty electrical enclosures suitable for junction and pull box applications. The boxes are available with either a lift-off screw cover or a hinged cover. The Bud JB and JBH NEMA 1 Sheet Metal Boxes feature 16 GA welded steel construction and ANSI 65 gray powder coating. Included are knockouts on all four sides (on boxes with greater than 3' depth), four wall mounting holes in back, and embossed grounding hole in bottom.