Plastic wall anchors come in a variety of sizes and styles to help hang items on hollow walls. The ribbed plastic anchors are usually the best choice for heavier items. The ribbed anchors expand as you tighten the screw, creating a strong hold in drywall. As the anchor expands, the ribs help to hold the anchor in place. Installing ribbed plastic anchors correctly is key to a strong hold that lasts.
Mark the point on your wall where you want to mount the anchor and screw with a pencil.
Drill a hole at your mark that is slightly smaller in diameter than the ribbed plastic anchor using a drill and drill bit. This provides a hole that is large enough for the anchor but not too large that the ribs are ineffective.
Insert the ribbed plastic anchor into the hole and tap it with a hammer until the anchor is flush with the wall surface.
Place the screw into the anchor and thread it clockwise by hand until it engages the anchor. Tighten the screw into the anchor with a Phillips-head screwdriver, leaving the head of the screw 1/2 inch from the wall's surface. This allows room for hanging items on the screw.