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Uma kuziwa ekusikeni okunembile kwezicelo zezimboni, Amakhithi we-annular cutter avele njengamathuluzi ababalulekile ochwepheshe abafuna ukusebenza kahle nokunemba. Ngokungafani nezingcezu zendabuko zokubhola, ama-annular cutters aklanyelwe ukususa umgogodla we-cylindrical enkundleni yokusebenza, ezenza zilungele ukudala izimbobo ezihlanzekile ezintweni ezahlukahlukene, kufaka phakathi insimbi, izinkuni, namapulasitiki. Le ndatshana idlulisa ku-t