... ,100-150x17cm, other sizes are available upon request; 3. Normal thickness: 2cm, 3cm and ect.; 4. Finish: Polished, honed, flamed, sandblasted ... . Quality control: Polished degree: More than 85 degree, as requested, Thickness tolerance: +/-1mm, +/-1.5cm or +/-2mm, The quality requirements must ... stone, curbstone, monument, etc Natural stone stair treads with low price and A grade