Champion Chisel, 1-1/8 by 6-Inch Hex Shank, Clay Spade - Clay Spades are effective at breaking through rocky soil and through hard ground to get below the frost line. They are often used for utility work and installation of in-ground swimming pools. Designed for 60-90lb Class Pavement Breakers. 1-1/8" x 6" pavement breaker chisels are for 60-90 lb class pavement breakers. Also known as Jack Hammers, these tools are used for moderate to heavy concrete demolition. All tool measurements are "under the collar".