Bayani dalla-dalla na rivets na makafi

Bayani dalla-dalla na rivets na makafi:

1. Gabaɗaya, akwai jerin lambobi shida na 2.4 / 3.2 / 4 / 4.8 / 5 / 6.4.

2. Tsawon shine jeri 11 6-8 — 8.5 — 9.5 — 11 — 12.5 — 13 — 14.5 — 15.5 — 16 — 18 — 20.

3. Tsawon kasuwa shine 22-25-30-40-50-60 (mm).

4Fasahar ƙarfe mai diamita 3.2 za ta iya kaiwa tsawon mm 16.