5/16 x 2-1/2 Lag Bolts Hex Head Stainless Steel Heavy Duty Wood Screws Qty 250. Lag screws, also commonly reffered to as lag bolts, are heavy duty wood fasteners.Lag screws require a pilot hole pre drilled before installation and to be driven in with a ratchet due to their size. Quantity of Fasteners in Package : 250. Hex Head Width Flat to Flat : 1/2. Tracking is provided on ALL Orders. UPS Next Day Air is available, Please inquire for pricing. For YOU, we constantly strive to find ways of improving our performance.