Pipe clamps are based around using standard plumbing pipe. To a plumber the inside is more important than the outside. What sets this pack apart from the usual is that we have had the outside plated so it's perfect for use as a woodworking tool. These 3/4" bore pipe packs consists of two 900mm lengths of steel pipe. Each piece threaded at one end ready to take a pipe clamp head. This pack is suitable for the Axminster heavy duty pipe clamp set.