The Hangman Black Bear Claw is a double-headed, anchorless screw which works best with D-rings or wire for simple mirror and mirror and picture hanging solutions. Installs with a hand-held phillips screwdriver. Self-drilling tip installs easily into drywall, lath and plaster and wood. Installs into concrete or brick with pilot hole. Will hold 30 lbs in drywall and 100 lbs in wood.