... grey, white, black, yellow, green, red, brown and etc.; 2.Standard Size: Step,100-150x33cm, Riser,100 ... are available upon request; 3. Normal thickness: 2cm, 3cm and ect.; 4. Finish: Polished, honed, flamed, sandblasted, ... Thickness tolerance: +/-1mm, +/-1.5cm or +/-2mm, The quality requirements must be comfirmed by customer. Welcome to inquiry ... etc Natural stone stair treads with low price and A grade