Wrench Combination Metric Long 12 pt 12mm Box end has built-in N-PowerFit Drive- Increased strength and reduces rounding or fastener damage by distributing stress through a gentle arc in the bore by enlarging the contact surface. Open end has reinforced teeth to prevent cracking and breaking. Angle rise of 15 degree for box end. Clear engraving- The beautifully-refined engravings are easy to see and increase the efficiency of work.. Compact external diameter is among smallest in the world and ideal for tight spaces. Long pattern 12 point, 12 mm size NMS2L-12