WBs are used for connecting the boards with the wall or the floor. The bracket spikes are pressed firmly into the surface of the board, and then the board is offered in position, and screwed through the holes of the bracket.
PBs are used to hold two boards perpendicular while the adhesive is drying. The bracket spikes are pressed firmly into the surface of each board, after applying a bead of silicone on each board side.
JBs are used to connect two boards together in line such as partition wall. The bracket spikes are pressed in the blue core of each board after applying a bead of silicone in between