Ridgid 36127 Model 412M 12 mm Lever Instrument Bender is a dual-purpose product being both inch and metric. The 90-degree set up generates the leverage required to produce smoothdistortion-free bends to 180 degree in soft coppersteeland stainless steel tubing. The open-side design slides over tubing at any point. This bender is clearly marked in 15-degree increments. Throat tube O.D. 12 mm and wall bend radius 38 mm.