Our 1-3/4” plastic washers are available with or without stems. For use with soft materials like insulation, order the EP3 washer. Order the EP4 washer without stem if a flat plastic washer is needed for use over hard face materials like gypsum board. A Model 500M tool with a washer holder for these plastic washers is available. (Plastic washers are a non-stock items, available by special order).