CONCRETE NAILS | Head type: Flat Surface Galvanized zinc Dia: 3/16 1/4 Length: 1 to 6 Feature: 25 mm~ 150mm (1~ 6) Material: High quality steel Description: round head ,smooth body, groove twist shank. Surface treatment: electric galvanized. Packing: 25 kg/carton bulk packing , small box or according to the requirement of customers.