Triple Tooth™ Bi-Metal hack saw blades utilize maximum cutting efficiency with three teeth sizes.  Lead off with 32 tpi, move to 24tpi for more aggressive strokes and complete stroke with 18tpi. Cut wood, plastic or any machinable metal, including conduit, stainless steel tubing, angle iron, copper tubing, structural materials and more. 10 pk. Manufactured by M.K. Morse.