DESCRIPTION CLASS WEIGHT LENGTH I.D. O.D. CATALOG # #UB1 Short 4-ilb. to 30-ilb. .9 ilb 18.5" .750" .838" UBS1 #UB1 4-ilb. to 30-ilb. 1.15 ilb 20.5" .750" .838" UB1 #UB2 Short 30-ilb. to 50-ilb. 1.15 ilb 19" .875" .970" UBS2 #UB2 30-ilb. to 50-ilb. 1.2 ilb 20" .875" .970" UB2 #UB4 80-ilb. 1.6 ilb 24" 1.00" 1.133" UB4 #UB6 130-ilb. - Unlimited 1.9 ilb 24.5" 1.188" 1.336" UB6 #UBSC2 Short, Curved 30-ilb. to 80-ilb. 1.2 ilb 20" .875" .970" UBSC2 #UBC2 Curved 30-ilb. to 50-ilb. 1.6 ilb 30" .875" .970" UBC2 #UBSC4 Short, Curved 80-ilb. 1.6 ilb 24" 1.00" 1.133" UBSC4 #UBC4 Curved 80-ilb. 1.9 ilb 29.5" 1.00" 1.133" UBC4 #UBC6 Curved 130-ilb. - Unlimited 2.4 ilb 29.5" 1.188" 1.336" UBC6