Roller blind system with double chain/decelerator spring operation. Steel piano-wire clutch stop with uncoupling mechanism for spring raising with raising deceleration mechanism. Uses aluminium alloy boxes of: Rollbox 565: 65x74,3 mm, Rollbox 585: 85x102,2 mm. The system is suitable for domestic and professional environments. 200 cm W max. and 300 cm H max. The blind can be stopped in any position. Ceiling or wall installation. Versions 565 and 585 are fitted with an inspectable box for blind maintenance. The two systems can also be used without side guides. The aluminium side guides are available in widths of 55-65-80 mm.