Hillman Rigid Box Rail Hanger Straight Bolt

One half has a lag thread wood screw with a pointed tip, and the other half has standard machine thread with a blunt tip. From the Manufacturer These hanger bolts are headless bolts designed to hang materials from wooden structures, walls or overhead. Wood Screw Threads On One End And Machine Screw Threads On The Other End Woodworking Or Hobby Used With A Pre Drilled Hole