The main difference is that the durable construction provides a higher operating speed and they are able to sustain a higher number of cycles (opening and closing cycles) and require lower maintenance and repair cost.
Umehluko omkhulu wukuthi ukwakhiwa onensika ihlinzeka ephakeme isivinini yokusebenza bayakwazi ukusekela inombolo ephezulu ka imijikelezo (ukuvulwa kanye lokuvala nowe) futhi lidinge yesondlo aphansi futhi ukulungisa izindleko.