MODEL SIZE(mm) W.L.L.(lbs) PROOF LOAD(lbs.) B.L.L.(lbs.) N.W(lbs.) LBR-8 1/4"-5/16" 2200 4400 7800 3.52 LBR-10 5/16"-3/8" 5400 10800 19000 10.5 LBR-13 3/8"-1/2" 9200 18400 33000 12.9 LBR-16 1/2"-5/8" 13000 26000 46000 14.