A single thread woodscrew mainly used in various types of timber and man-made boards. The collated strips are specifically designed to be compatible with all leading power tool brands Dual thread to assist with clamping" Thread Dia. mm: 4.2 Length mm: 40 Thread Length mm: 26.7 Head Type: Double Countersunk Recess Type: Phillips Point Type: Single Slash Driver Bit Size: PH2 Finish: Zinc & Yellow Material: Carbon SteelSize 4.2 x 40 - 1000 Pieces Timco Solo Collated Chipboard & Woodscrews - PH - Double Countersunk in Yellow