Key Features: Stainless-steel structural fasteners designed for lag-screw replacement. These hex-head fasteners require no predrilling, making them easier and faster to install than typical lag screws. They meet 2015 and 2018 IRC® and IBC® code requirements for several common wood-framing applications. Strong-Drive® SDWH TIMBER-HEX SS Screw 0.188 in. x 4-1/2 in. 5/16 Hex, Type 316 (100-Qty) (Pack of 6).