Yellow plastic anchors are designed for hollow wall application in drywall. Used only for lightweight applications where holding strength is not critical. It has a one piece body with two horizontal slits which open to allow grip to the outside walls of the hole. It should not be used for overhead. Drill hole to the minimum depth required. Clean hole of dust after drilling. Insert anchor through the fixture and tap the anchor until it is flush with the surface of the material. Insert the proper size screw into the anchor and tighten until fixture is securely fastened.