The Model 324 Electronic Work Center makes work areas more efficient and manageable. This practical, pre-assembled combination includes a 315 Circuit Board Holder, a Model 300 Standard Base, a Model 312 Parts Tray Base Mount and a Model 371 Soldering Station. The single control knob and exclusive "split-ball", locks the Circuit Board Holder firmly in place. If you release the knob pressure the Circuit Board Holder Tilts 90 deg., Turns 360 deg. and Rotates 360 deg. The Circuit Board Holder is easily removed from the base, which accepts all Model 300 series Heads.