This tool is for torx socket screws manufactured with an internal pin. They are a popular security drive for high torque applications. Quickly and easily installed and removed using matching tooling. We have a full range of AB Self Tapping and Metric Machine Screws stocked in A2 Stainless Steel and also stock Barrel Nuts and Self Drilling Screws with the 6-Lobe Pin Drive. This item is sold in singles.Please allow 3 to 5 working days for delivery.