Gabatarwar samfur:
Round karfe ne m cylindrical karfe, wanda diamita za a iya tsara a daban-daban masu girma dabam bisa ga samar da bukatun.Tsarin sarrafawa ya haɗa da mirgina mai zafi, zane mai sanyi, ƙirƙira da maganin zafi da sauran hanyoyin.Daga cikin su, mirgina mai zafi shine tsarin da aka fi amfani dashi, wanda zai iya samar da karfe zagaye tare da diamita mafi girma.Tsarin zane mai sanyi zai iya samar da ƙaramin diamita da babban madaidaicin zagaye karfe.