8 in 1 multi-function socket wrench 8 in 1 spanner dog bone spanner universal rotation multi-head spanner

1. Bright chrome: bright as a mirror;

2. Chromate: dull;

3. Electrophoresis: black, with brightness, under the action of applied direct current, make the charged particles in the dispersed medium force to the cathode or anode to do directional movement, promote the separation of substances;

4. Phosphating: black, but the luster is dark, the material is immersed in phosphating solution, in the excrescence surface deposition forms a layer of insoluble water crystalline phosphorus, is hydrochloric acid conversion process.

5. Gray nickel: is a new surface treatment, rust resistance, and will increase the service life of the product.

6. Others are black, pearl nickel and titanium plating treatment

Quenching is one of the basic means to strengthen steel. It is a traditional method to harden steel into martensite and then temper it to improve toughness.

After the wrench has been quenched, the stiffness and strength of the wrench have been improved, so as to make it more durable, higher quality and more varieties