The unique patented Velocity screw has been specifically designed to give rapid installation into many different materials, whilst achieving exceptional pull-out resistance. It has been designed to give the user a consistent and reliable product that can be used in a variety of applications. Dual angle thread designed for superior hold Partially threaded stops the timber jacking. NOTE: Partially threaded from 40mm Rapid drive twist cut enhances drive performance Slash point tip helps prevent the timber splitting when screwing close to the edge, whilst also helping to reduce torque. NOTE: Slash point from 25mm and above " Thread Dia. mm: 4.0 Length mm: 20 Thread Length mm: 20 Head Type: Double Countersunk with Ribs Recess Type: Pozi Point Type: Quick Start Driver Bit Size: PZ2 Finish: Zinc & Yellow Material: Carbon SteelSize 4.0 x 20 - 200 Pieces Timco Velocity Premium Multi-Use Screws - PZ - Double Countersunk - Yellow