The MAC TOOL #XDL4MM Socket Allen 4mm X 3/8″ drive long shaft is a single item standard metric socket designed for use with a 3/8″ drive. Made by MAC TOOL, this high-quality socket features a long shaft for added reach and leverage, making it ideal for automotive and mechanical applications. With a 4mm size and hex/Allen drive type, this socket is a versatile and essential tool for any skilled mechanic or DIY enthusiast.