• 6-point Dynamic-Drive™ profile provides longer life for screws and nuts • Chrome plated micro-matte finishing provides high quality surface • High-performance alloy steel • With hole to locate stud • Hardness: 42 HRC to 48 HRC • Sizes marked with * are hollow along the shank • Standard: UNE 16586 • Available in black plastic pouch • SB: retail pack on a plastic info card