Dottie TB125 - 1/2'' x 5'' Slotted Mushroom Head Toggle Bolt is made of carbon steel with a zinc plated finish. It is adjustable for various thicknesses and suitable for hollow block, wallboard, plaster, plywood, and other hollow base materials. The contractor-oriented design features wings that distribute load evenly. Pre-drill size is 1-1/4'' and bit size is #3. Anchor type is Toggle Bolt with a 1/2'' anchor diameter. Drive type is slotted, thread pitch is 1/2''-13, and thread style is UNC. Easy to use and durable.