FastenMaster FMTHR008-6 ThruLOK Screw Bolt Fastening System, 8 Inches, 6-Count Manufactured in United states Easy to use Highly durable Replaces 1/2 inch carriage or through-bolts without predrilling Installs with an 18 volt cordless drill No special bits or wrenches needed Meets all corrosion requirements and is guaranteed for the life of the project Code compliant fastening method with current code documentation