Comparison : Item # 72151-1/2 & 3/4, 4 11/16" Square Boxes with Concentric Knockouts
Item # 72171-1/2 & 3/4, 4 11/16" Square Boxes with Concentric Knockouts
Item # 72171-3/4 & 1, 4 11/16" Square Boxes with Concentric Knockouts
Item # 72171-1 & 1 1/4, 4 11/16" Square Boxes with Concentric Knockouts
Item # 72171-1/2,3/4,1, 4 11/16" Square Boxes with Concentric Knockouts