Igwe ihe na-agbagharị agbaji bụ nkenke ihe na-agbagharị agbagharị emebere ka ọ na-ejikwa ibu radial jikọtara ọnụ na nnukwu otu ntụzịaka n'otu oge. Jiometry conical aha ya bụ igodo, na-enyere ya aka ijikwa ma bufee ibu ndị a jikọtara nke ọma.