SFU1605 set: SFU1605 rolled ball screw C7 with end machined + 1605 ball nut + nut housing+BK/BF12 end support + coupler RM1605 rolled ballscrew assembles1 set sfu1605 l750mm bk12 bf12 ballnut end support 1605 nut housing bracket 6 35 10mm couplers