Simpson Strong-Drive structural wood screws. High-strength alternative to through-bolting and traditional lag screws. Bold thread design provides superior holding power. Patented 4CUT tip to ensure fast start and reduced installation torque, eliminating pre-drilling in most applications. Large head provides maximum bearing area. Double-barrier coating makes screw suitable for exterior and preservative-treated wood applications. Bit included in package. Screw diameter: 0.195″ with large hex head drive.