radially outermost portion of each such non gauge reaming blade b 3 b 7 to avoid contact with any part of an opening at about the pass through diameter this configuration of blades b 3 b 7 and cutters 224 b has proven to be particularly useful in efficiently drilling through equipment called u201c float equipment u201d used to cement in place the previously referred to casing by positioning the cutters 224 b on the non gauge reaming blades b 3 b 7 as described herein damage to these cutters 224 b can be avoided damage to the casing not shown can be also be avoided by arranging the non gauge cutters 224 b as described particularly when drilling out the float equipment although the non gauge reaming blades b 3 b 7 are described herein as being formed by causing these blades to conform to the pass through circle cp it should be understood that the pass through circle only represents a radial extension limit for the non gauge reaming blades b 3 b 7 it is possible to build the reaming tool 10 with radially shorter non gauge reaming blades however it should also be noted that by having several azimuthally spaced apart non gauge reaming blades which conform to the pass through circle cp the likelihood is reduced that the outermost cutters 224 a on the gauge reaming blades b 1 b 2 will contact any portion of an opening such as a well casing having less than the drill diameter another aspect of the invention is the use of cutters 224 b positioned on the reaming blades b 3 b 7 located outside the overlap section x prior art reamer wings typically had blades.