http://www.fastpack.net/super-lite-weight-magnet-attachment-stretch-film-dispenser/?page_context=category&faceted_search=0 Light Weight Stretch Dispenser *2 Mounting Attachments/Rack and Magnet Attachments *Quick Connect Feature *Works Best with Pre-Stretch *Fits 15" and 18" Rolls *External Tension Adjustment *Made in the U.S.A. Instructions 1. Slide Yellow Core Inserts into Stretch Film 2. Secure Stretch Film by connecting Long and Short Support Bars. 3. Adjust tension by turning End Knob.