Both models are suitable for left/right hand and single/double doors, offering concealed installation for maximum visual elegance. They feature hydraulically controlled closing and backcheck. Closers offer spring strength of EN 3, 4 and 6 (BTS 80) and EN 1-4 (BTS 75 V), conform to DIN EN 1154 and are certified to ISO 9001. A universal cover plate is adaptable for all types of door and is available in stainless steel or satin brass. A range of interchangeable spindles provides greater floor clearance and special spindles are offered. Constant closing cycle is temperature independent. Other accessories include door straps, top centres and sealing compound for filling cavities between floor spring body and cement box.