CBH self tapping screws undergo quenching(heat treatment)during production and processing to increase hardness and performance.

　　After phosphating(black phosphorus)(gray phosphorus)treatment,CBH products have higher rust prevention performance.

　　CBH products are made of Shougang material,with a galvanized layer of 23-25 grams,and the amount of galvanizing is higher than other products.

　　Adopting the new technology of dual inlet and dual outlet thread head,it has stronger penetration,faster and more secure.