This tool is use for pinching off tubing producing a hermetica lly perfect cold -weld of tube walls; ends are neat and clean. The most common application is pinching off vacuum exhaust tubing of fully annealed OFHC copper. (See graphics above) Other soft metals such as fully annealed aluminum, .070 in. OD X .010 in. wall Kovar, annealed nickel, thin wall 52 alloy and platinum, can be pinched off. Jaws are hardened, ground, high speed tool steel (Rockwell C60 to 65). For pinching tubes up to 3/8 in. OD and inner wall thickness of .049 in. See AVAILABLE DOWNLOADS below for POD-375 Pinch-Off Tool Operating Instructions.