Package Includes: 1 pc 6" hole saw, 1 pc arbor with drill bit, 1 pc pilot drill bit (replacement), 1 pc hex key Sharp and Durable: Crafted from bi-metal construction, this hole saw features high-speed steel teeth and a flexible steel body for enhanced durability and sustained sharpness Lightweight & Handy: Structural innovations significantly reduce the weight of this holesaw without compromising quality, resulting in less labor during operation and more efficient chip removal. Wide Applications: Engineered for smooth, clean cuts on wood, plastic, drywall, cornhole boards, and thin metals (excluding stainless steel). Ideal for DIY home projects and professional job sites. Easy Assembly: Rotate the arbor and hole saw until nearly closed (avoid over-tightening), then align the locking pins with the guide holes and secure with screws Pro Tips: 1. Not recommended for brittle materials such as glass, ceramic, tile, granite, marble, porcelain, brick, masonry, or natural stone - these materials can chip easily and will quickly dull the saw teeth. 2. Allow the hole saw to cool before touching - surface temperature is high after drilling. 3. Apply water or coolant and reduce feed speed when drilling metals. 4. Stop immediately if abnormal vibration occurs.