洴（ping）葂（mian）軜（na）強（qiang）疔（ding）淎（peng）概（gai）颁（ban）箵（xing）變形縫 ZKNQ-GB-P

转（zhuai）龣（jiao）噺（na）炝（qiang）飣（ding）篣（peng）摡（gai）螁（ban）鉶（xing）變形縫 ZKNQ-GB-L

1.simple structure, large scalability, no screw on surface

2.commonly-used in indoor equipment.

Disadvantages:

Due to the reason of its own structure, the outer base is not completely on the same level with the cover board.