PGMJ 80 Pieces M6 Wood Inserts Bolt Furniture Screw in Nut Threaded Fastener Connector Hex Socket Drive for Wood Furniture Assortment (M6x15mm)

What is the thread pitch? M6x1.0 or M6x0.8?

What metal is the insert made of?

What size hanger bolt works with this?

I bough this product and it does not work with m6 1.0 (https://www.amazon.com/gp/product/b07k456p6g/ref=ppx_yo_dt_b_asin_title_o03_s03?ie=utf8&psc=1)