Imperial Tool 470FH Triple Head 180 Degree Tube Bender, 3/16", 1/4", 5/16" and 3/8" Quick-action indexing lever repositions two-stage handle midway through Bend. This feature allows easy fabrication of bends up to 180 with reduced effort, better control and No Crossing of handles Optimum bending radius  for each tubing Size Compact design for working in tight spaces. Cushion grips  for comfort and stability Imperial benders are sized for OD of tubing, not nominal or ID sizes. For best results please select only OD dimensions