drywall screws,black/grey phosphated fine thread,coarse thread H-L ... 3. Surface: Black/grey phosphate 4. Thread: Fine/coarse Drywall screws Drywall Screw 1. Material: C1022 2. Length: 15mm-150mm 3 ... zinc plated 5. Thread: Fine/coarse 6. Main Feature: With drilling point, bugle head, phillips drive, coarse/fine Thread 7. ... : Small package or bulk, according to customers' requirement. drywall screws