Expansion Screw Anchor Anchor Diameter 1/2 in Overall Length 1 1/2 in Screw Size 1/2 in Thread Size 1/2 In.-13 Thread Depth 1.125 in Thread Type Coarse Material Zamac Alloy Finish Plain Drill Bit Size 7/8 in Minimum Installation Depth 1 1/2 in System of Measurement Inch Expansion Anchor Type Caulking Anchor Material Grade/Class Not Graded Compatible Material Block Brick Concrete Stone Installation Method Machine Screw Minimum Hole Depth 1 1/2 in