This document provides information about hidden telescopic attic stairs, including its specifications, models, features, installation process, operation process, and production display. It discusses details like the treads being fitted with dovetail joints or metal dowels for durability or easy assembly. Both semi-assembled and fully-assembled models are available, with a test load of 300kg and maximum working load of 150kg. The document also mentions an adjustable opening door spring mechanism and the ladder being fastened with angle brackets for precise positioning.