• Hardness: HRC44 ~ 52.
• Material: Carbon Spring Steel.
• Finish: Black Phosphate coating (ACP).
• Kit contains 4 popular metric sizes (external type) & 4 metric sizes (internal type).

External Type 16mm
External Type 19mm
External Type 25mm
External Type 30mm
Internal Type 19mm
Internal Type 22mm
Internal Type 30mm
Internal Type 35mm