Izingxenye ze-roller zeminyango nezinsiza: Ukuqhathaniswa kokonga umsebenzi phakathi kwe-roller eyodwa ne-roller ezimbili Emkhakheni wezinsiza zehardware, ama-roller eminyango nezinsiza adlala indima ebalulekile ekuqinisekiseni ukuvulwa nokuphuma kahle kweminyango nezinsiza. Phakathi kwezinhlobo ezahlukene ezitholakalayo, ama-roller eminyango nezinsiza (门窗滑轮) akhanya.