General description Specifically designed for fixing cement board to steel dry-lining frames (max. 3.0mm), these TIMCO Self-Drilling Cement Board Countersunk Exterior Silver Screws ensure a secure and flush finish with their self-countersinking head. The screws feature a self-drilling point along with a self-tapping thread, making installation efficient and straightforward. Technical specifications Dimensions: 4.2 x 32 mm Maximum thickness for steel frames: 3.0 mm Coating: Exterior grade for superior corrosion resistance