1pc 25mm Ball Screw Rolled C7 ballscrew 2505 SFU2505 350mm BK20 BF20 end processing+1pc SFU2505 METAL DEFLECTOR Ballscrew nut 25mm 2505 ball screw rolled c7 ballscrew sfu2505 1000mm plus 1pc single ballnut for the support bk20 bf20