The initial development of the company was powered by the market demand for sliding windows and doors, while European companies had few solutions for it. Rollers for different grooves, various locking solutions for C groove leaf profiles, many flush locks and pull handles have been developed for sliding doors and windows. The smart design of the C groove locking system achieved several solutions, unlockable solution with square spindle handles or folk handles, lockable solution with cylinder for entrance door, pull handle for heavy door solutions, that covered all range of people’s demand for sliding windows and doors. From the cooperation with and services to fabricators, HOPO became the leading brand in this field. Patents have been registered for hundreds of products.