The PC-3 Snap-On Mesh Chair is economical heavy duty, four sided chair that quickly snaps onto the mesh, 4 ga. to 10 ga., to correctly position it in the slab. The Snap-On Mesh Chair is available in most heights from 3/4″ to 3″ and the Snap-On Mesh Chair with Base is available in heights from 1-1/2″ to 4″.