What's the difference between 21V and 25V electric wrenches?

Answer:

Electric wrench is mainly used in the steel structure installation industry, specially installed steel structure high-strength bolt, high strength bolt is used to connect the steel structure contact, usually with bolt group way. High strength bolts can be divided into torshear type and the big six angle two GB, torshear type high strength bolt for M16, M20, M22, M24 four, M27, M30 non GB two GB; six angle high strength bolt for several M16, M20, M22, M24, M27, M30 etc..

Electric wrench is power or battery powered wrench, is a kind of high strength bolt tightening tool, also known as high-strength bolt gun. It can be divided into impact wrench, torsional shear wrench, fixed torque wrench, corner wrench and angle spanner.

Lithium battery energy package specifications are different, usually high voltage, energy, electricity capacity is large, the use of a charge after a long time, but the weight will increase.