Square simbi rudzi rwezvinhu zvine akasiyana maumbirwo, hukuru uye zvivakwa zvakagadzirwa neingi, billet kana simbi nekumanikidza kugadzirisa. Inogona kukamurwa kupisa kupisa uye kutonhora kutenderera; Rutivi rwehurefu rweyakapisa yakakungurutswa simbi simbi ndeye 5-250mm, uye iya yechando yakadhirowewa simbi simbi ndeye 3-100mm.