I am confused regarding the differences of that 3 items. Can you clarify it for me?

By searching I learned that

A "product" is a manufactured (and often branded) object or commodity.

An "item" is one of a collection of different things, such as things that are in a stock (say in a shop), or on a list, or something similar. Items can be products.

"material" is the stuff that something is made of.

What to say if I'm pertaining to an item (small items, like screws used for implants) that has a brand? I want to use it in a system flowchart if this might help you.

I am confused regarding the differences between these 3 words. Can you clarify them for me?

By searching I learned that

A "product" is a manufactured (and often branded) object or commodity.

An "item" is one of a collection of different things, such as things that are in a stock (say in a shop), or on a list, or something similar. Items can be products.

"Material" is the stuff that something is made of.

Which word should I use to refer to an item (e.g. small screws used for implants) that has a brand? I want to use it in a system flowchart if this might help you.