Faithfull Chisel Steels are produced to provide high-performance in all types of modern large capacity drilling and hammer drilling machines. Manufactured using traditional forging skills such as hammer work on chisels and drop stamp forging of cutting blades, they fit the most popular 21mm Hex shank machines used in the UK. Type Chisel. Length 380mm. Width 25mm. Fitting 21mm Hex shank, Kango (900/950K).