DeWALT® Toggle Bolt, Wing, Measurement System: Imperial, 3/16 in Screw, 4 in Overall Length, Carbon Steel, Round Head, 1/2 in Drill, UNC Thread, AISI 1010 Spring, 3 in Clearance Wing Spread, 2-1/2 in Maximum Work Thickness, 140 lb (3/8 in Wallboard)/190 lb (1/2 in Wallboard)/235 lb (5/8 in Wallboard)/280 lb (3/4 in Wallboard) Ultimate Load/595 lb and 120 lb (Hollow Concrete Masonry) Ultimate and Allowable Shear Strength, 130 lb (3/8 in Wallboard), 185 lb (1/2 in Wallboard), 235 lb (5/8 in Wallboard), 290 lb (3/4 in Wallboard) Ultimate Load, 250 lb and 50 lb (Hollow Concrete Masonry) Tensile Strength, Zinc Plated