Get this Thrulok 8 in. Screw Bolt Fastening System delivered onsite. Replaces 1/2 in. carriage or through-bolts without periling. Installs with an 18-volt cordless drill. No special bits or wrenches needed. Meets all corrosion requirements guaranteed for life of the project. Code compliant fastening method with current code documentation. Installation/code bulletins included in each box. Manufactured in specific lengths to tackle primary deck applications: 8 in. fastener – double 2x to single 4x decking posts.