Features: Engineered with left hand spirals design and premium carbides alloy, these 2mm/2.5mm single flute end mills boosting cutting efficiency by 15% while minimizing workpiece deformation for precise engraving and machining. Featuring 3.175mm shank diameter, 15mm/17mm cutting length, and hardened HRC60+ construction, these durability milling cutter ensure extended tool life and compatibility with most engraving machines and routers. Ideal for professional machinists, metalworkers, and DIY enthusiasts requiring high precise tooling for detailed engraving projects or industrial material processing. Perfect for aluminum milling, nonferrous metal fabrication, mold making, and intricate carvings applications where vibration reduction and chip evacuation is critical. The optimized single flute geometrys enhances chip flow by 30%, enabling smooth operation in highly speed engraving machines while maintaining consistent cutting. Specifications: Component: Alloy Size:Approx.3.8x0.3175cm/1.5x0.125inch Option Blade Length:17mm,15mm; Blade Diameter:Approx.2mm,2.5mm; Applicable scenario: Circuit board/nylon/plastic processing; Package Includes: 20pcs/set Left Single edges routers Bit note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.