Rawlplug Tex Screw Steel to Timber with G16 Washer are self-drilling screws that can be driven into steel without the need to pre-drill. These countersunk head screws are used for fixing steel to timber such as metal cladding to a timber frame. The bonded washer then gives a weather tight seal. Each bag contains 100 screws along with a free driver. Available in a range of lengths.