OZCO Ornamental Wood Ties (OWT) 3/4 in. x 1-1/2 – 4 in. OWT Timber Bolts are specialty fasteners that combine the beauty of the OWT Hex Cap Nut and Timber Screw with the strength of a through-bolted connection. These bolts are engineered to replace standard thread-all, carriage or other similar through bolt arrangement. OWT Timber Bolts are specially designed to work in conjunction with Ornamental Wood Ties and connectors but are also very useful in any location where a strong bolt connection is required. This bolt features our patent-pending “inside – out” compression technology. When tightening conventional through bolts the more the fastener compresses the material the more the fastener is exposed. The exposed threads can create a safety concern or visual distraction that is often unacceptable.