a crest oppositely disposed ridges on the insert lie substantially in the same plane thereby forming two planes intersecting on the crest the two planes are substantially perpendicular the inserts are arranged on the cone such that one plane is substantially parallel with the insert row and the other is substantially parallel with the cone axis application_number US 34173908 A description the present invention will now be described more fully hereinafter with reference to the accompanying drawings in which embodiments of the invention are shown this invention may however be embodied in many different forms and should not be construed as limited to the illustrated embodiments set forth herein rather these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art like numbers refer to like elements throughout a bottom view of an embodiment of an earth boring bit 30 is provided in fig2 the bit 30 comprises three cutter cones 32 wherein each cone includes rows of inserts formed thereon the outermost or heel row is formed on the heel surface 34 and includes heel row teeth 36 as shown the heel row teeth 36 have a generally hemispherical configuration inner rows 40 42 are formed on each cone between the heel row and the nose of each cone 32 the inner row 40 includes inserts 46 disposed on its outer surface the inner row 42 proximate to the nose of the cone 32 also includes inserts 44 in the embodiment.