Strong, reliable support for residential, commercial, or office stair projects. These hot-dip galvanised stair stringers are paired for 10 steps and engineered for concrete-in installation, delivering solid compatibility with aluminium or timber treads. Each pair provides a clear span up to 17 steps when paired with suitable tread options and a maximum tread width per pair of 1200 mm. The rise and going are set for comfortable, code-conscious stairs: 175 mm rise and 250 mm going. Key details Pair of stringers (2 pieces) in hot-dip galvanised finish RHS profile: 75 mm x 50 mm x 2.5 mm Bolt hole: 14 mm; tread bolt holes: 8 mm; slots: 11 mm x 18 mm Rise: 175 mm; Going: 250 mm Treads: 3 (configurable with chosen treads) Footing options: In-Ground, Bolt-On-Concrete, Landing To Landing Designed for concrete-in installation and engineered to meet standard load conditions per applicable building codes. Suitable for pairing with a range of tread choices to create a complete stair assembly. Shipping options available. In‑store pickup available — contact us for pickup location & hours.