CPI Standard Busbars are insulated ground bus mounting plates specifically designed for commercial applications. The Hard-Drawn Electrolytic Tough Pitch 110 Alloy solid copper bonding bars are 1/4" (6.4 mm) thick and stand off 2.75" (70 mm) from the backboard or wall. The 10" (254 mm) Busbar accepts 1/4" (6.4 mm) single bolt lugs. The 12" (304.8 mm) and 20" (508 mm) Busbars provide connection for nine or 17 lugs respectively, accepting lugs with either 3/4", 1" or 1-3/4" (19 mm, 25.4 mm or 44.5 mm) centers. Any lug with 3/8” (9.5 mm) bolts may be used.