Zvakatipoteredza-zvine hushamwari zvinoumba jecha disc 28 mhando:

Iyo yakasarudzika-inoshamwaridzika inoumbwa nesanding disc 28 inogadzirwa neakasarudzika emery jira rakasungirirwa pane yakasikwa-inoshamwaridzika substrate. Iyo inharaunda-inoshamwaridzika SG (super green) hasha disc inoratidzirwa nekuchengetedza kwakanyanya uye kwakanaka kuchinjika; jira reEmery uye substrate zvese zvine hushamwari nharaunda. Mashoko acho anoshandiswa kupuruzira mabhuru emoto uye nzvimbo dzepende dzezvikepe, mota pamwe nendege.

Zvakatipoteredza-zvine hushamwari zvinoumba jecha disc 29 mhando:

Iyo inovhenekera inoshamisira inoumbwa nejecha disc 29 inogadzirwa ne zirconium corundum abrasives, zvedongo abrasives uye yakaoma inotsigira base. Chigadzirwa chine kutonhorera kunoitika kana iwo unhani unosimudza uine hukuru hwekucheka kuita. Inogona kushandiswa kune general simbi kukuya uye zvakare yakakodzera kune yakaoma kukuya uye Wet kukuya.