SPEC Size: 20mm, 25mm, 30mm, 35mm, 40mm, 42mm, 45mm, 50mm, 55mm, 60mm Material: diamonds Usage:Suitable for drilling holes in rock slab/marble/quartzite/granite/tile etc. Features: Serrated bit, fast hole opening, brazing process, direct dry drilling FEATURES VERSATILITY AND COMPATIBILITY - This Hole Saw Opener is designed for maximum versatility and compatibility with various drills and materials. It supports a wide range of drill types, including corded and cordless models, ensuring flexibility in usage. EFFICIENT CUTTING PERFORMANCE - Constructed from high-quality diamonds, this hole saw opener ensures durability and long-term performance. The diamonds construction combines toughness and heat resistance, ideal for cutting through tough materials without overheating. EASE OF USE AND SAFETY FEATURES - Featuring an intuitive design, this hole saw opener is easy to install and operate, even for beginners. The arbors come with quick-change mechanisms or hex shanks for effortless attachment to drills, reducing setup time. COMPREHENSIVE SIZE SET - Available in various size configurations, this opener caters to different project requirements. Kits may include additional accessories like replacement drills, extension rods for deep hole cutting, and storage cases for organization and portability. Package Includes: 1×Hole Saw Opener for Drill