a) Ikwiranye n'akabuto ko guhagarika byihutirwa kanda cyangwa kazunguruke
b) Bikoreshwa byoroshye kandi bikarinda abakozi gukora nabi burundu
c) Ikwiranye n'amaswichi yombi afite umurambararo wa 22mm-30mm.
| Igice nimero. | Ibisobanuro |
| SBL07 | Umwanya w'umwobo: 22mm; uburebure bw'imbere: 35mm |
| SBL08 | Umwanya w'umwobo: 30mm; uburebure bw'imbere: 35mm |


Gufunga by'amashanyarazi n'iby'umwuka