Zinc plated hooks are the framing industry standard and traditionally used for hook and wire hanging
Works well in drywall or wood paneled walls
1 3/4" high x 3/8" wide
Includes one nail size 7D, 2 1/4 inch long
Holds up to 100 pounds
When driving a hook nail into the wall, take care that the proper downward nail angle is consistently maintained. Elongating the nail hole in the wall will reduce the shear strength of the hook.
Hammer nails in completely, so that the back of the hook is flush with the wall surface. When the hook is flush, stop. Continuing to hammer will weaken the nail's grip, especially in drywall.
Nickel-plated hook nails will easily penetrate wood wall studs but will bounce off the aluminum wall studs found in many modern commercial buildings. If you encounter a metal stud, move the hook slightly to the left or right of the stud position (studs are typically about 1 3/4" wide).
Consider using two hooks, spaced apart appropriately, for all your hook & wire hung picture frames. Your pictures will stay straighter, longer, and they will be more secure over time.
You can double or "gang" nickel-plated hooks (place two or three together side-by-side) to gain additional holding power.
Always apply the picture load gradually on wall hooks to insure proper hold.
With wired picture frames where you are "working blind," always check behind the hung picture to make sure that the picture wire is actually caught on the hook portion of the hook and has not gotten snagged on the top edge of the hook by mistake.
To remove nickel-plated hooks, pull directly back from the nail head at the angle of the nail using fingers, pliers or vise-grips. Prying a hook away from the wall with a screwdriver, etc. will usually damage the wall surface. If you have to use the claw of a hammer to remove a nickel-plated hook nail, place something with a solid surface between the hammer's head and the wall (a thin book will serve in a pinch).
As long as a removed hook or nail has not been bent or deformed, it can be reused.