ZPG1156 Features: * Quick change chisel retainer * Holds .401"" shank chisels * Fits most popular air hammers * Safe to use, fast to change chisels * Just pull back collar to install or remove chisels * Retainer becomes part of tool eliminating need for other retainers Dimensions: * Dimensions: 0.5"" H x 4.25"" W x 6.5"" D