There's a screwdriver. What can you call that side of the hammer?
Impact screwdriver made of hardened steel special, can bear larger load, with the commonly used word in the six party, and the cross impact head, mainly used to loosen the bolts of rust or cold live, can also be used for final fastening bolt.
This is also called impact impact screwdriver, screwdriver, a special screwdriver through the hammer screwdriver, instantly generate great torque to rotate the bolt.
