The Grobet 6" Bastard Cut Mill American Pattern File is a high-quality tool made of steel, specifically designed for deburring and shaping metal surfaces. With a USA origin, this file is durable and reliable for various metalworking tasks. The set includes 4 pieces, making it versatile for different projects and applications in the metalworking industry. Perfect for professionals in CNC, metalworking, and manufacturing, this product ensures precise and efficient results.