Made of high quality steel, heat-treated to achieve the hardness yet flexible enough not to break This item is not compatible with any general sawzall machine. This blade only works with tool that has SHEATH at the front Blade tool used for glass, auto glass, windshield, windscreen removal, auto body shops and glass tinting shops Size: 1.5" x 10" Our windshield/auto glass removal express blade are made of high quality stainless steel with proper treatment to make the blade strong yet flexible. Strong enough that the blade will last long; Sharp enough that it will remove the urethane with ease; Flexible enough that it does not break. All sizes ( 3" x 14", 3" x 12", 3' x 10", 1.5" x 12" and 1.5" x 10") fit our Push Knives ( Our product Part# PK-15, PK-24 & PK-33). With Push Knives, it is quite easy to remove the quarter glass. It will make every glass job easy when removing and trying to save un unbroken glass from the car. The narrow width makes it easy to cut through urethane without putting too much stress on the glass Made of high grade stainless steel. All our blades gone through a vigorous and sophisticated tempering process to make sure they are not too stiff or too flimsy. Just perfect and last a long time. Many technicians consider them the best blades in the market,