У вашего броузера проблема в совместимости с HTML5
http://www.learningconstruction.com Step by step tutorial: Always remember to use safety googles, gloves and necesary hardhat before using any construction tool! Steps: 1. Cut the pipe to the size you need. 2. Rim the end of the pipe to avoid having steel slivers in your pipe. 3. Adjust the threader pipe size to the size of your pipe. Then begin threading the pipe and add oil to avoid overheating and burning the dies. 4. complete the thread by passing the threader 1 1/2 threads past the threader