... owner 2). Ten years experience. 3). Good packing Natural stone stair treads:1.Color: grey, white, black, yellow, green, red, ... bronze bar etc.; 5. Packing: Fumigated wooden crates; 6. Quality control: Polished degree: More than 85 degree, as requested, Thickness ... tolerance: +/-1mm, +/-1.5cm or +/-2mm, The quality requirements must be comfirmed by customer. Welcome to inquiry about ...