Adjustablefitting; can be used both with lamp bases and with ceiling cord sets and big or small incandescent bulb.
固定件可调节；可与灯座和天花板吊灯及大小白炽灯泡并用。
2
The instrument are designed with adjustable center holes at both ends that make its fitting and measuring rapidly and easy.
该仪器两端设计有可调心式中心孔，安装测量迅速方便。
3
Gliding setting: endurable and wear resisting slip fitting in slider part, adjustable gap. It is easy to assemble, and it makes little noise and has a long working life.