From the back of the cover:
At last, gaming screens for players, too!
The Thief's Screen speeds up game play by taking the most frequently used character-specific information from the AD&D game Player's Handbook, Complete Thief's Handbook, and Complete Bards's Handbook and making it instantly accessible. Now the details players need on the spot to play any rogue class - including thieves and bards - can be right at their fingertips. The screen folds in a neat triangle that sits on the table top in front of players for at-a-glance reference.
Also enclosed are eight additional pages of valuable reference material that can be slipped into character folders. These pages feature an extensive Player's Handbook and Tome of Magic spell and spell-statistics list for bards characters, and other handy tables and charts.