U-ring wrench set made of chrome vanadium steel according to DIN3113. Matt finish. Manufactured with absolutely tight tolerances to ensure a perfect fit to the bolt and nut. 12 edges in the ring side with 15 degree angle. Supplied in practical packaging. Contains: 6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21-22-24-27-30 and 32mm.