up u201d and u201c down u201d u201c upper u201d and u201c lower u201d u201c uphole u201d and u201c downhole u201d and other like terms indicating relative positions to a given point or element are utilized to more clearly describe some elements of the embodiments of the invention commonly these terms relate to a reference point as the surface from which drilling operations are initiated as being the top point and the total depth of the well being the lowest point the present invention is directed to a helical chisel insert for a drill bit such as a roller cone bit the helical design of the insert provides an aggressive shape for increased penetration during drilling in addition the helical chisel insert is suitable for positioning the inserts in a vectored manner on the drill bit to achieve an orientation that provides increased resistance to insert breakage and or and increased rate of penetration fig1 shows a drill bit in accordance with an embodiment of the present invention indicated by 2 drill bit 2 has a threaded section 4 on its upper end for securing to the drill string not shown a frusto conical roller cone cutter 8 is rotatably mounted and secured on the bearing pin shaft 16 which extends downward and inward from the bottom of the journal segment arm 6 cone cutter 8 has a cutting structure consisting of.