General description Used when constructing drywall track and ceiling track systems to stitch the track together (Max. 3.0mm) without the need to pre-drill a hole. These screws feature a Phillips Wafer Head design, making them suitable for drywall applications. Technical specifications Size: 4.2 x 13.5mm Quantity: Boxed in quantities of 1000 Surface hardness: Up to 650 HV Manufactured to SAE J48-1979 specification Other information CE approved to EN ISO 14566:2008 standards