* Don yankan babban kumfa zuwa tsayi daidai, yanka.
* Mahimman kayan aiki don masana'antar kera kumfa.
Babban kumfa a cikin isometric, takarda, injin yankan takarda.
Shahararrun injuna waɗanda injiniyoyin ƙasashen waje suka yi, galibi injunan shawarar.
Wannan abin yankan kumfa a tsaye shine mafi mahimmanci.
Kuma na'ura ta duniya don kowane kasuwancin yanke da kumfa.