Description: This T-type screw is a new type of screw is mainly used in stepper motor, machine tool rails and other equipments. Feature: Diameter: 8mm screw Lead distance: 1/2/4/8/12/14mm (lead refers to a circle in a straight line distance) (Optional) Material: All stainless steel screw Steel length: 500mm Quantity: 1pc Package includes: 1 x 500mm Lead 1 x Screw nut