All screws is made by the good quality materials and professional work team , and passed the salt-fog test more than 48hrs.

1. Raw materials : AISI-C1022

2. Materials properties: surface carburization 0.10mm

3. Surface treatment; electric zine , phosphating.

4. Examination : passed the salt-fog test more than 48 hours.

5. Product spec : M3.5X25, M3.5X30,M3.5X35,M3.5X40,M3.5X45,M3.5X50 etc ..

                          M3.9X11 , M3.9X32 etc .

P.S. : we can make any size by order .

Drywall screw