Rotary wand with attached circular saw blade

A tool for cutting predetermined length sections from pipes and the like from either the inside or the outside of the pipe being cut, said tool including an elongated shank section, mounting means on one end of said shank section, coupling means on the other end of said shank section for removably coupling a source of rotary input torque to said shank section, a rotary abutment collar assembly mounted on an intermediate portion of said shank section for rotation of said shank section relative thereto and including means operative to adjustably position said collar assembly along said shank section and to releasably retain said rotary abutment collar assembly in adjusted position on said shank section against axial displacement therealong, a circular rotary saw blade, said mounting means mounting said saw blade on said one end of said shank section concentric with said shank section and with said mounting means drivingly connecting said shank section to said rotary saw blade and supporting the latter on said shank section against axial displacement relative thereto, said abutment collar assembly including means defining a reduced diameter cylindrical projection on the axial end of said collar assembly opposing said blade with said cylindrical projection concentric with said shank section and the portions of said axial end of said collar assembly disposed radially outwardly of said projection defining a shoulder facing toward said mounting means, the diameter of said cylindrical projection being less than the diameter of said saw blade.