Nkọwapụta izugbe nke rivets kpuru ìsì

Nkọwapụta izugbe nke rivets kpuru ìsì:

1. N'ozuzu, e nwere usoro isii nke 2.4 / 3.2 / 4 / 4.8 / 5 / 6.4.

2. Ogologo ya bụ usoro iri na otu 6-8 — 8.5 — 9.5 — 11 — 12.5 — 13 — 14.5 — 15.5 — 16 — 18 — 20.

3. Ogologo ahịa ahụ bụ 22-25-30-40-50-60 (mm).

4Nkà na ụzụ ígwè anaghị agba nchara nke nwere dayameta 3.2 nwere ike iru ogologo 16mm.