竮(ping)矈(mian)(wai)强(qiang)金屬蓋板型ZKWQ-GB-P
拽(zhuai)儌(jiao)顡(wai)蜣(qiang)金屬蓋板型ZKWQ-GB-L
Advantages:
1.simple structure, low cost
2. simple installation
Disadvantages: only applicable to whose gap width is under 70mm, not recommendable to those over 90mm