Staircase Basic Information Staircase Structure = Stringer + Tread Support + Railing + Handrail Item Materials Dimensions Finished Stringer Carbon Steel / A3 Steel / Stainless Steel ( 90% client choose Carbon steel ) 300*60(5+5)/(6+6)mm Powder Coated Mirror / Brushed 300*10mm / 12mm 250*150*5/6mm Tread Support Carbon steel / Stainless steel 6/8mm thick tread support Step Marble Steps Customized.. Polish Timber Steps Oak, Beech, Walnut, maple.. Painting / Vanish Glass Steps 10+10+10mm / 12+12+12mm Clear Stairs Railing ( Height=36-48inches) We have many guardrails for you to choose from, such as glass railing, steel railing, cable railing, wrought iron railing ...Also, we can customized the railing as per your design. Free supply 3D drawing and cad drawing. ( 3D drawing to check the design, cad drawing is aim to check the size) Included All Standard Accessories