These Premium Mortising Chisels and bits are precision machined and factory sharpened for perfect results right out of the box. We tested just about every name brand Mortising Chisel on the market including some from Europe and tested them side by side against these Japanese ones. It is our opinion, that there isn’t a Mortising Chisel on the market today that is better in quality and performance than these. Expensive? Yes. Worth it? Absolutely! Each hollow Mortising Chisel has a 3/4" O.D. shank to fit 3/4" drill press collars. Made with pride in Japan.