Zip Driver Flat Head Deep Thread Screws With Nibs &Type-l7 Point-Robertson® Square Recess
Our Square Drive Zip Drivers combine the Type-17 self-drilling point that pre-drills itself with the original Robertson® Square Drive Recess for optimum performance. We then added the nibs under the head to help make this a true "One-Step" fastener. Simply put one on the driver bit and watch it pre-drill and self-countersink itself in most all types of wood.