- 28 mm carbide-tipped hole saws, designed for precise and durable cuts in metals - Includes nitrided pilot drill bit and L-wrench, making installation and safe use easier - Tungsten carbide tip (TCT) ensures low consumption, impact resistance, and wear resistance - Suitable for stainless steel, iron, mild steel, alloy steel, and aluminum - Compatible with handheld, bench, and magnetic electric drills, ideal for industrial and DIY use - High-precision centering bit, hard to break, for greater safety and accuracy - Not suitable for tiles, glass, concrete, or stone - It is recommended to add coolant and use protective glasses and gloves during use