Generally Conforming to IS 2029-1998 Drop forged from high grade Chrome - Vanadium steel.Heat treated to give maximum strength and wear resistance.Good accessibility in confined spaces due to thin walled rings and are light and handy in use. Slightly rounded handles sand blasted fit snugly in the hand and gives comfortable grip.Clearly marked facilities choice of right size.Non damaging grip on the nut due to close wrench opening tolerances.