Here are your new black vinyl coated storage hooks. This 2 piece set is made of metal and is the screw in type. 6 inch in length before install, a 2 inch drop down, 4 inches of storage width with a 3-3/4 inch front rise. 1/2 inch safety lip. 1 inch thread exposure. At 5/16 inch thick, each hook is rated for up to 20 lbs. In theory, you may think 2 hooks will hold 40 lbs. That may be true for a short span, but an extension ladder or something long, at least use 3. That is simple safety logic. 1/4 inch to 3/16 inch pilot hole is required. Use a little soap or wax for easy install. Now, if you wall mount, in a stud of course, you may want to screw the hook in beyond the threads to allow the hook to either touch the wall, or close to it. Could also use a small block of wood or furring strip. This is in case there is flexing from the weight. They will rest against the wall. Keep them as level as possible, and spaced to evenly distribute the weight. Same for ceiling mount. There might be some vinyl coating on the threads, this will not impede the installation. Thanks for stopping. Please visit my slow growing store, view my items and policies, and read about me, if you like. David - thediscountretailer