Metallics Combo anchor spring wing toggle bolt features steel construction with zinc chromate finish for superior corrosion resistance. This UNC bolt has thread of size 10 and 24 TPI. It measures 4-Inch x 3/16-Inch Dia. Mushroom - truss headed bolt has slotted/Phillips driver. It has tensile strength of 245 lb for 1/2-Inch wallboard. This bolt is perfect for light-duty anchor for use in hollow block and gypsum wall.