Package includes: 1 Pair Door Hanging Wheels Roller Set(8 Wheels) 1 x Screw Bag Feature: 1.Model:105 2.Dimension:Please see the picture 3.Material:Cold rolled steel 4.8 Silent Wheels 5.Compatible for sliding wooden doors of home,office,etc. Installation: 1.Drilling holes 2.Hanging wheels:install hanging wheel into hanging rail and install the limitator on both ends of the rail.According to the door height,adjust the screws of the wheel 3.Fixed the rail 4.Slotting:Install the inserting piece on the both ends of door,use screws to fixed with door.Open a down guiding groove of the bottom of door 5.Limit wheel:Put down guiding wheel install on the floor 6.Finish installation:Put the hanging wheels inserting piece into the inserting slot on the door top and fixed it with screws.Put the down guiding wheel to the guiding groove of the door bottom.