*Bevel Washers are required on Stair End Posts less than 2" in diameter for use with Standard or Deluxe Series cable kits on at least 1 End of a stair rail. Can be used on both ends if you want the fittings on the angle on each end of your stair railing to match. So you need 1 or 2 qty per cable kit on stairs. They are optional on Stair End Posts Larger than 2" in diameter.