13-18” cxa 250-333 wedge type quick change tool post set lathe tooling 250-333 wedge type tool post. 250-301 Turning Tool Holder, use tool bit up to 3/4 250-302 Boring, Turning Tool Holder, use tool bit up to 3/4 and round shank tool bits up to 3/4 250-304 Heavy Duty Boring Bar Holder, use 3/4 and 1 shank boring bars 250-307 Parting Blade Tool Holder, use 3/4 high parting blades.