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If you are interested in our products, please directly contact Kathy in following contact way. Looking forward to hearing your news! Kathy: email address/skype: sales28(at)primahousing.com whatsapp/wechat: +86-18296157872, QQ: 2457879661 indoor hidden stringer staircase hidden stringer stairs Product Description 1, PRIMA Staircase Exactly Specification: Staircase Carbon Steel Stair Beam Square Beam /Mono Stringer 100*200*6mm+6mm Treads Support Plate 100*150*5mm+5mm Treads