My company wants to send workers to the UK, need help what visa to apply for

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My company (located in Bosnia in Hercegovina) is interested in sending 10 workers to the UK for a period of 10 to 12 months. Their work duties would consists of assembling and loading metal trays. The company already received an offer from a UK based company (that would act as their sponsor) but we are now having trouble figuring out what visa to apply for.

As far as I understand Tier 2 is the most likely choice, but I'm not really sure if they could pass considering the work they're supposed to do is somewhat low skill. Could they apply for a Tier 5 (Temporary Worker - International Agreement) visa?

Alternatively, what other choices would be available for them if they are not ellegible for Tier 2 nor Tier 5 visas?

Thank you kindly in advance for any assistance you would be able to give me.