Powers™ Hollow Wall Anchor, Heavy Duty, Series: Strap-Toggle™, 1/4 in, 1/4-20, Engineered Plastic, Base Material Thickness Range: 3/8 to 2-1/2 in, 4 in Overall Length, 1/2 in Drill, UNC, 2-1/2 in Grip Range, 2-1/2 in Maximum Work Thickness, 1420 lb and 285 lb (Hollow Concrete Masonry) Ultimate and Allowable Shear Strength, 1355 lb/270 lb (Hollow Concrete Masonry) Ultimate/Allowable Tensile, Zinc Plated