ST ikurikirana ibyiciro bitatu bigenzura ingufu zirahuzagurika kandi uzigame umwanya wububiko muri guverenema.Ibyuma byayo biroroshye kandi byoroshye gukoresha.Igishinwa nicyongereza cyamazi ya kirisiti yerekana irashobora kwerekana byimazeyo ibipimo bisohoka hamwe numwanya wa mugenzuzi.Ibicuruzwa bikoreshwa cyane mu gutwikira vacuum, fibre yikirahure, itanura ya tunnel, itanura ya roller, itanura rya meshi nibindi.