What Are Hollow Wall Anchors Used For. Once spread, the anchor cannot be pulled back through the smaller installation. There are two basic types of expandable metal anchors.
M4, M5, M6 Hollow Wall Steel Screw Screw Anchors (Like ... from i.ebayimg.com
Once set at the back of the hollow wall the anchors legs pull back to form a cross section spreading out the weight across a larger area. Hollow wall anchors are used to support objects hung on the wall. Hollow wall anchor with drive, or with l hook, or with c hook, or with o hook.
Those with pointed tips can be hammered into the wall.
Not suitable for use on ceiling drywall as downward pressure could cause the anchor to slip out. Once set at the back of the hollow wall the anchors legs pull back to form a cross section spreading out the weight across a larger area. They have reasonable shear (vertical) strength for things like paintings and small, light shelves. Hollow wall anchors work where simple screws won't.
