Hex washer head tapping screw 1.Screw size:ST2.2-ST9.5, #0-#18 2.Screw material:C1022, C1018 3.surface:zp,HDG,black oxide Features: Galvanzized/Zinc Plated Indented Hex washer Head socket Tapping Screw 1.tapping screw Standard DIN6928,JIS B1123, JIS B1126, ISO 7053 or as per your need.2. Material C1022, C1018-C1010, SUS304, SUS303, SUS316, ROHS complaint3. Surface Finish zinc plated,plain finish, ...