Designed to bend heavy-wall steel tube (up to 1/8 Inches wall thickness), stainless steel tube (up to 3/32 Inches wall thickness), and hard copper water tube (types K and L). Produces uniform bends up to 180" with no need to anneal tubing or to use special temper grade tubing. High-geared design is easy to operate with minimal effort required. Marked with inch and metric sizes. Tube outside diameter: 5/8 Inches (16 mm) Benders produce uniform bends up to 180" with no need to anneal tubing or use special temper grade tubing. Reduce bending effort to a minimum.