【Heavy-Duty M42 Cobalt Hole Saw Kit】 This professional-grade hole saw set is engineered for durability and performance, built to outlast standard bi-metal saws. Featuring premium M42 cobalt steel teeth, a 50mm deepened body, and efficient chip ejection, it's designed to handle tough jobs with ease. 【Built to Last, Ruggedly Tested】 Every hole saw is tested for extreme durability: 600+ holes in stainless steel, 800+ holes in wood, galvanized pipe, and drywall. The hardened M42 cobalt teeth resist heat buildup and wear, staying sharp longer than conventional saws, even when cutting hard metals. 【Deepened 50mm Body for Thick & Recessed Drilling】 Unlike standard 37mm deep hole saws, this set features a 50mm deepened body, allowing you to cut through thicker materials and reach recessed surfaces without repeated passes. Perfect for wood studs, multi-layer drywall, and deep-set pipes. 【Efficient Chip Removal for Smooth Cuts】 The unique stepped chip ejection slots quickly clear debris during cutting, preventing clogging and overheating. The open design lets you remove cut cores in seconds, keeping your workflow fast and frustration-free. 【Multi-Material Versatility】 From wood and PVC to drywall, aluminum, galvanized pipe, and even stainless steel, these hole saws handle it all. Ideal for electricians, plumbers, and DIYers installing door locks, recessed lights, vents, and pipe openings. 【Universal Compatibility】 The kit includes both 1/4" and 3/8" hex shank arbors, compatible with most standard power drills and impact drivers. The spring-loaded pilot drill prevents wandering, ensuring precise, centered holes every time. 【Organized Storage Case Included】 All 13 pieces come neatly organized in a durable, impact-resistant plastic carrying case (case dimensions: 20 x 15 x 6 cm). The case keeps your hole saws protected from damage, prevents loss, and makes it easy to transport the kit to any job site. 【Package Includes】 - 9 x Hole Saw Blades (13/16", 7/8", 1", 1-3/16", 1-3/8", 1-3/4", 1-7/8", 2", 2-3/8") - 1 x 1/4" Hex Shank Arbor - 1 x 3/8" Hex Shank Arbor - 1 x 6.35mm Pilot Drill Bit - 1 x Conversion Screw - 1 x Storage Case (20 x 15 x 6 cm)