Safety Clamps are tools for handling flush joint pipe and drill collar. there are two kinds of model of safety clamps. Model WA-C Safety clamps can accommodate pipe from 31/2 to 155/8inch(88.9-396.9mm)O.D Model WA-T Safety Clamps can accommodate pipe from 11/8 to 41/2(28.6-114.3mm)O.D.............. Model Handling pipe size Weight in mm kg lb WA-C 3 1/2-4 5/8 88.9-117.5 20.9 46 4 1/2-5 5/8 114.3-142.9 25.0 55 5 1/2-6 5/8 139.7-168.3 27.7 61 6 1/2-7 5/8 165.1-193.7 29.1 64 7 1/2-8 5/8 190.5-219.1 31.3 69 8 1/2-9 5/8 215.9-244.5 32.7 72 9 1/2-10 5/8 241.3-269.9 40.0 88 10 1/2-11 5/8 266.7-295.3 41.8 92 11 1/2-12 5/8 292.1-320.7 44.0 97 12 1/2-13 5/8 317.5-346.1 46.3 102 13 1/2-14 5/8 342.9-371.5 48.6 107 14 1/2-15 5/8 368.3-396.9 50.9 112 WA-T 1 1/8-2 28.6-50.8 16.3 36 2 1/8-3 1/4 54.0-82.6 18.2 40 3 1/2-4 1/2 88.9-114.3 20 44