It's been manufactured based on KSF 4424. There are three types, solid type, one-way type, and two-way type. It's the fourth type adding the one-way changing the movement of the rectangular angle of bridge axis.It previously prevents the chaos of directional sense during the installation.

During the earthquake movement, both bridge fall-off and rise prevention device is added like B-type. Low friction count. The flourisine resin is installed in sliding part so that the durability is extended. The exchange of stand excluding both sole plate and base plaste makes the repair and exchange morefacilitate.

Also, the lower part of the base plate is bonded with the anker control nut so that the horizontal balance is possible through the delicate control of anker control nut on bridge udring the installation of stand.