having large amounts of grainy sand one such hard metal is sintered tungsten carbide that is compacted into inserts 34 for some applications inserts 34 may be referred to as 34 compacts 34 these hard metal inserts 34 typically last much longer in abrasive formations than do milltooth bits which are typically formed from a relatively soft metal used to manufacture the respective cone cutter that may be thinly coated with an abrasion resistant material abrasive formations quickly wear away this thin coating and then even more quickly wear away the exposed milltooth bits insert 34 has a base 52 of depth d for insertion into a socket 48 and a cutting tip or chisel 54 which protrudes a height h from the cone cutter surface base 52 includes a top 56 a bottom surface 58 substantially parallel front and rear surfaces 60 and 62 and curved opposing side surfaces 64 and 66 chisel 54 includes front and rear flank surfaces 68 and 70 a crest 72 formed at the convergence of flank surfaces 68 and 70 and having opposing ends 74 and 76 width w1 and length l1 and opposing curved end surfaces 78 and 80 flanks 68 and 70 are singular planar surfaces that ascend longitudinally from top 56 and converge to form crest 72 although crest 72 is shown having a rounded surface crest 72 may have a surface of another shape such as flat or pointed surfaces 58 60 and 62 are also substantially planar referring to fig5 a plan view is shown of insert 34 taken along line 5 5 of fig4 because inserts 34 and sockets 48 are closely sized for an interference.