MGEHR1616-3 lathe tool holder The MGEHR1616-3 lathe tool holder is made from high-quality 40Cr steel, known for its excellent strength, rigidity, and corrosion resistance. The MGMN300-G carbide inserts feature a hard-coated alloy, offering superior toughness, wear resistance, and heat tolerance. Wide-Ranging Application: This tool holder and insert combo is designed for deep and wide grooving, suitable for machining a variety of materials including stainless steel, iron, copper, aluminum, and non-metallic pipes and plates. Precise Insert Dimensions: MGMN300-G carbide inserts have a thickness of 2.35mm (0.093"), length of 21mm(0.827" ), and height of 4.8mm (0.189" ), with a P=7°cutting angle, designed for efficient and accurate medium-width grooving operations.