MM Surface drive (SF)

MM SF surface drive sockets are designed to improve engagement on fasteners by emphasizing contact on the flats rather than concentrating force on the corners (application dependent; verify per listing). This “surface drive” / flank‑grip style is commonly chosen in maintenance and service work where fasteners may be tight, painted, or slightly worn, and where reducing the risk of rounding is important (application dependent). Surface-drive designs can be useful in automotive, industrial maintenance, and assembly environments where consistent torque transfer and secure fit help improve productivity (application dependent).