The manual tong is an essential tool in oil drilling operation to fasten or remove the screws of drill pipe and casing joint or coupling.It can be adjusted by changing latch lug jaws and latch steps. Type Q340/8 (13 3/8 in) casing tong is capable of making up or breaking out the screws of casing and casing couplings of 14 3/8 in in drilling operation, the rated load of it is 8KN.m. Type Q89 - 432/90 (3 1/2 17 in) DB Manual Tong is used for making up or breaking out the screws of drill tools and casing joint or coupling. It can be adjusted by changing latch lug jaws and handling shoulders. Please feel free to tell me getting the detail of all the types