Spax Washer Head Rear Panel Screw (1000pc) ....Spax rear panel screws are ideal for securing thin wood, composite or sheet metal to wood framing or backing. The wide bearing surface under the washer head prevents overdriving and deforming the contact point. Ideal for rear panels on cabinets. For use with a #2 Pozidriv bit. (Note - Spax now only offers the #8x1 1/4" size here in the US (in retail packaging of 30pc....available at Menards and other big box stores). I still have a few other lengths available in contractor packaging...sale limited to supply on hand.