... 20T-26T,A 40GP will be 40T-52T.additioal processes Washer assembly,Heat treatment,Baking hydrogen,Anti-slipping patch can be ... than 20 years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on .2. Our company had good reputation ... ,good at modern concept of management.3. We have special research person and more than 100 equipment to produce fastener.Perfect quality ...