This 3D model represents a backstop prototype for CNC lathes, designed to accommodate workpieces with diameters ranging from 40mm to 70mm. The backstop ensures precise positioning and stability of the workpiece during machining operations, enhancing the overall accuracy and efficiency. The design incorporates adjustable components to cater to various diameters within the specified range, and it is constructed from durable materials to withstand the rigors of high-speed machining.