Description:This T-type screw is a new type of screw is mainly used in stepper motor, machine tool rails and other equipments.Features:Diameter: 8mm screwLead distance: 12mm (lead refers to a circle in a straight line distance)Material: All stainless steel screwSteel length: 100mmQuantity: 3pcPackage include:3 x Lead3 x Screw nut    ,,,