This is a high-quality brass nut with a flange that can be used to connect T8 lead screws to CNC and 3D printer parts. The nut has a pitch of 2mm and a lead of 8mm, which means it moves 8mm for every rotation of the screw. The flange provides stability and prevents the nut from slipping off the screw. The nut is compatible with T8 lead screws with a diameter of 8mm and a length of up to 400mm. This nut is ideal for CNC and 3D printer Z axis applications, as it can provide smooth and precise linear motion.