Tube benders *For:1/4",5/16"&3/8" size O.D. tubing. *Material ... : Al alloy body *No marking, scraping or flattening of tubing CT-368-90°-A For:1 ... /4",5/16"&3/8" size O.D. tubing. ... CT-368-90°-M For:6mm,8mm&10mm sizen O.D.tubing Note: (1 ... thin tube without distortion.(3)Calibrated marking for making accurate left-hand,right-hand, ...