Linear Motion Guide Actuators Package includes: 1 x SFU2005/SFU2010 Ball Screw 1 x HM15 Motor Mount 1 x BF15 holder. 1 x DSG20H Nut Housing 1 x LF30 x 40-12 x 14 (with 5 mm keyway) Model Number:SFU2005 SFU2010 Guide Width or Diameter: 20mm ?