Format: 3ds Max 2020
Export: OBJ
Render: Corona 9
Materials: Corona Physical MTL
The scene shows two versions of the KVM-G-2 staircase

Small-sized L-shaped staircase 2025-2250 mm KVM-G-2:
https://legko-shop.ru/catalog/mezhetazhnye_lestnitsy/modulnye_lestnitsy/malogabaritnye_modulnye_lestnitsy/g_obraznye_malogabaritnye_lestnitsy/malogabaritnaya_modulnaya_lestnitsa_kvm_g_2_vysota_2250_mm.html