Hammer Drive Pin Anchor, Anchor Diameter 1/4 in, Overall Length 1 3/8 in, Thread Size Not Applicable, Thread Length Not Applicable, Anchor Material Steel, Pin Material Steel, Finish Zinc Plated, Head Type Flat, Nut Width Not Applicable, Washer Outside Diameter Not Applicable, Drill Bit Size 6 mm, Minimum Installation Depth 1 3/16 in, Maximum Material Thickness 3/16 in, Pin-Drive Anchor Type Fixed Nail-Drive Anchor, System of Measurement Inch, Compatible Material Block, Brick, Concrete