Holds up to 150 lbs leaving only a pin size hole! Installs easily by hand Great for mirrors, pictures, shelves and more  The Hercules Hook is the easiest way to hang pictures, mirrors, shelves just about anything. Hercules Hooks are easy to install just twist, push and turn! No more drilling or pounding to try to find a stud - No more damaged walls! The reinforced steel design provides the muscle to hang and hold up to 150 lbs. Great for plaster, drywall or paneling. Twist, Push, Turn. Pick a point on the wall where you want the bottom of the hook to sit. Then, measure 1/4" directly above that point and set the tip there. Next, with firm forward pressure, twist the hook back and forth (like a key) until you have chiseled through the wall. Now turn the Hercules Hook upward and push completely into the wall until only the hook is exposed.