indoor granite stair 1.specialized factory 2.customed size 3.ISO approval 4.fast delivery indoor granite stair1. Color: red, green, white, yellow, black,grey etc2. Size: according to custmer's requirement3. Quality: tolerance degree +-1mm, polish degree 90up4. Finishing: polish, honed, flamed, bush-hammerd, sawn5. Delivery time: usually 15 days upon your quantity indoor granite stair