High-Speed Steel Blades: This electric rotary cutters features finely ground high-speed steel blades for excellent wear resistance. It supports a maximum cutting thickness of 33mm, delivering clean and precise cuts for various fabrics. Automatic Sharpening: The cordless fabric cutters includes a built-in automatic sharpening function. A light press of the button for 1-3 seconds quickly sharpens the blade, ensuring consistent and efficient cutting performance. Large Capacity Battery: Powered by two 4000mAh rechargeable lithium batteries, this handheld sewing rotary cutters provides strong power for extended use. It supports fast charging in approximately 100 minutes, with an indicator light that signals when fully charged. Safety & Ergonomic Design: Featuring a thickened protective cover and an ergonomic lightweight body, this round knife cutting machine minimizes the risk of accidental injuries. It allows for comfortable ones-handed operation, even during extended sessions. Versatile Application: This electric fabric cutters can effortlessly handle delicate chiffon, thick textiles, leather, carpet, upholstery, and more, making it an ideals tool for various sewing and crafting projects.