The External Hook is used to inside casings or tubings to catch all kinds of ropes,lifting bails,hollow short cylinders. The External Hook is used to inside casings or tubings to catch all kinds of ropes,lifting bails,hollow short cylinders,short rope slings such as wirelines,logging steel pieces,cables,etc..... TypeMax. O.D.(mm)Connection(in)Catch size(in)WG73732 3/8 Tubing coupling3 1/2 ...