5/8" Square Steel 8818S4 (Shown) (4 Bars) 18" Front Width x 16" Back Width 12" Deep - 3 " Clearance 11 Lbs. Master Pack: 1 095192 133438 8823-5 (5 Bars) 23" Front Width x 20 " Back Width 15" Deep - 3 1/2 " Clearance 15 Lbs. Master Pack: 1 095192 133513 8827-6 (6 Bars) 27" Front Width x 23" Back Width 15" Deep - 4 1/2 " Clearance 17 Lbs. Master Pack: 1 095192 133599