About Us. R S Wickramasinghe & Company (Pvt) Limited is a standard crusher aggregate and asphalt concrete providing company in Sri Lanka and its corporate office is based in No: 202, Weliamuna Road, Hekitta, Wattala, and the organization has its crusher operations in Medawachchiya, Mahadiulwewa, Kebithigollewa, Giriulla and Gampaha.Web