Standards: ISO 6787, DIN 3117, BS 6333, ASME B107.8M 1996. High-alloy quality steel. Angle 15 for type 31 for better accessibility. Angle 22.5 for the types 86 and 87 for better accessibility. Type 31 has left and right rotating screw. P Series: Reversible jaw for use as a pipe wrench. Phosphated. Precision hardening and anti-corrosion treatment. IP: Industry packaging.