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Product Name: Concrete Screw, Hex Washer Head & Flat Head Model NO.: 3/16 & 1/4 Standard: ANSI Head Style: Hexagonal Connection: Common Bolt Groove: Hexagon Type: Hexagon Head Material: Carbon Steel Plating: Ruspert Trademark: no Transport Package: Box, Carton Specification: 3/16, 1/4 Origin: China Product Description Concrete screws, hex washer combo. head or flat philip head, ruspert plating( 500 hours or 1000 hours salt test ).size: dia. 3/16" or 1/4" packing: 100pcs./box with 1 drill bit.* Our popular products with good quality & competitve prices, welcome your fresh enquiries.