Er Wrench Spanner for Collet Nut TOOL HOLDER, ER Wrench is a kind of commonly used installation and disassembly tool. It is a manual tool that uses lever principle to turn bolts, screws, nuts and other threads to hold the opening or sleeve hole fastener of bolts or nuts. Spanners are usually made of carbon or alloy structural steel. The wrench usually has an opening or sleeve hole at one or both ends of the handle to hold the bolt or nut. When used, the wrench can turn the bolt or nut by applying external force on the handle along the direction of thread rotation.

Specifications 
1.Er Spanner Model NO.:ER8/11/16/ 20/ 25/ 32/ 40/50 wrench spanner 
2.:ER SPANNER TYPE:UM,MINI,A 
3.ER Spanner Material: 42CrMo Hardness: HRC40-45 
4.Standard:American Type, Metric, British, German Type, European Type 
5.Feature:Anti-Explosion, Ordinary, Anti-Magnetic 
6.Origin:Jining, China 
7.Packaging Detail:  Plastic boxes, cartons 
8.Delivery Detail: 15-20 days after receiving the deposit and all package information confirmed.

surface treatment
1. Bright chromium: as bright as a mirror;
2. Chrome: no luster;
3. Electrophoresis: black and bright. Under the action of external direct current, the charged particles will move toward the cathode or anode in a dispersed medium force, thus promoting the separation of substances;
4. Phosphating: black, but dull luster, the substance is immersed in the phosphating solution and deposited on the instant noodles to form a layer of crystalline phosphorus insoluble in water, which is the process of hydrochloric acid conversion.
5. Gray nickel: it is a new surface treatment method with strong anti rust ability, and will increase the service life of the product.
6. Other treatments include blackening, ferronickel, pearl nickel, black nickel and titanium plating


Testing requirements
1. No rust, burr, crack, spot, etc;
2. The opening should be symmetrical, and the laser engraving should be clear;