Could I check what's the weight of this product?

Approximately 27KG

Hi available in pure black?

No

Hi! Can i know the dimensions of this7 rack?

You can refer to this.

https://cdn.shopify.com/s/files/1/2090/9995/products/dimension_b4b7d2e2-90d4-468e-8d95-463a3d9e4e88_grande.png?v=1527503479

how much space does this rack take?

Please see dimension from the product images.

https://cdn.shopify.com/s/files/1/2090/9995/products/dimension_b4b7d2e2-90d4-468e-8d95-463a3d9e4e88_grande.png?v=1527503479

hi can i know the dimensions and the difference between premium and normal. thx

Premium comes with plates storage and has stainless steel width adjuster.