Ajax Paving Breaker Chisels are manufactured from High Quality American Made Carbon Steel and are available in various shanks and point styles. This class of chisels are used in 35 lbs., 60 lbs., & 90 lbs. Paving Breakers/Jack Hammers. The construction industry uses Ajax Paving Breaker Chisels in concrete demolition, cutting asphalt, breaking up ground that is frozen and tamping material in place. Foundries and steel mills use Ajax Paving Breaker Chisels for chipping molten metals.