Abstract: A reamer for use with conduits comprising positioning means including engaging inclined surfaces for maintaining the reamer in relatively fixed relationship with the front or outer edge of the conduit being reamed, with the positioning means being capable of engaging conduits of various diameters and rotatable relative to the conduit being reamed. Reamer elements are provided including a front end for positionment adjacent the aperture in the conduit being reamed and a pair of inclined sections extending outwardly from said front end in opposing inclination to the engaging inclined surfaces, and being capable of engaging the inner edge of the conduit being reamed and rotated relative thereto.