The MM ARBOR B 40 7/8 - B16-3 from Field Tool Supply is a precision arbor designed for use with milling machines and other machining applications. This arbor features a B40 taper and a 7/8 inch diameter, ensuring a secure fit for various cutting tools. Constructed from high-quality materials, it offers durability and stability during operation. The B16-3 designation indicates compatibility with specific tool holders, making it versatile for different machining tasks. This arbor is essential for achieving accurate and efficient results in milling and drilling operations.