PREMIUM M42 COBALT CONSTRUCTION: M42 High speed steel with 8% cobalt content provides superior heat and wear resistance for cutting through tough materials including metal, wood, plastic, and composites VARIABLE TOOTH DESIGN: Features 4/6 varied teeth per inch pattern that reduces vibration and provides smoother, faster cutting performance; 1.75 inch cutting deep allows for drilling through thicker materials in a single pass, reducing time and effort on demanding projects VACUUM FURNACE HARDENED: Advanced vacuum heat treatment process and precision-ground teeth ensure maximum durability, outstanding abrasion resistance, long-lasting sharp cutting edges, extended blade life and resist dulling for efficient fast, clean cuts even under demanding conditions UNIVERSAL THREAD CONNECTION: Standard 5/8-18UNF thread arbor connection fits most standard mandrels or arbors and power drills for quick and secure attachment CONVENIENT PACKAGING: Arrives in a rigid color box for safe storage, transport, easy identification and easy organization in your workshop and toolbox Tackle tough cutting jobs with MaxTool 4-1/8-Inch (105mm) Cobalt Bi-Metal Hole Saw. This professional-grade hole saw features M42 cobalt high-speed steel construction with 1.75” cutting depth, delivering superior performance and durability when cutting through toughest materials. The innovative 4/6 varied tooth design optimizes cutting efficiency while reducing vibration during use. With its standard 5/8-18UNF thread connection, this hole saw integrates seamlessly with standard arbors or mandrels and power tools. The bi-metal construction combines durability with excellent heat resistance, allowing for efficient cutting action and extended use. The vacuum-furnace hardened teeth maintain their edges outstanding wear resistance and a tendency to stay sharper. The varied tooth design helps reduce vibration and promotes smoother cutting action across different materials. Multiple Knock-Out slots are for removing core easily. Thicker hardened wall and back prevent warping. Each hole saw comes securely packaged in a rigid color box for safe storage, transport, easy identification. The sturdy construction and precise grinding make the hole saws the best choice for contractors, DIY enthusiasts and professional craftsmen, while working on construction, maintenance, such as home improvements, remodeling, manufacturing settings, electrical installations, plumbing projects, and other professional applications. The quality hole saw delivers clean, accurate cuts with minimal effort.