Thread Size: 5/16 inch; Thread Length: 5 inch; Length is measured from under the head Hex Drive Size: 1/2 inch; Quantity: 10 sets (screws + flat wahsers) Fastener Standard: Lag screws meet standard ASME B18.2.1 Commercial/Industrial Grade A2-70; Flat washers meet standard ASME B18.22.1 Material: The sets are made of 304 stainless steel 18/8; Grade A2-70, Excellent toughness; Good rust and corrosion resistance in both indoor and outdoor use; Type 304 is the most versatile and widely used stainless steel Applications: It's used for a wide variety of household and industrial applications like deck buildings, heavy duty shelves or wood joining. Designed with a hexagon head and precise clean thread, it allows for great force to be applied without slipping and can be drilled into wood quickly and easily