● 支架可選：E，EF，N。Bracket optional：E，EF，N。
● 齒輪可選：8 10 25 45。Gear is optional：8 10 25 45
● 齒數(shù)可選：The number of teeth is optional。
● 可根據(jù)客戶要求定制。 Can be customized according to customer requirements