1Made of premium steel with high hardness, abrasion resistant and long lasting. 2The blade is extremely sharped, with good perforation capability. 3Professional and practical design, beautiful appearance, easy to carry and use. 4Can be used to make large holes in wood, thin steel sheet, aluminum alloy and other soft metal sheet. 5The newly designed chip removal groove, it can discharge the chip rapidly, and will not cause the crack and stuck piece phenomenon.