Smart appearance. Commercial and Residential use Size 1,2,3,4,5 are available. Closing & Latch speed controlled by two independent regulating vales. Imported O ring seal rubber and Hydraulic Oil. Rack and Pinion operation. Available color: silver, bronze, gold and white etc. Regular arm, Top Jamb application; Parallel arm is optional Manufactured By ISO 9001 Qualified Factory. Warranty: 5 years