No punching, stapling or tearing! Extruded aluminum clamps open to 1in. and hold up to 100 sheets. 20 lb. maximum weight. Use with the pivot or drop/lift wall racks and the mobile stand or mobile plan center (sold separately) . Recyclable. GREENGUARD (R) certified for healthier indoor air quality. Manufactured with reduced harsh chemicals and with processes that are 'low VOC' (low in volatile organic compounds) . Safco (R) Hanging Clamps, 18in. Long, Pack Of 6 is one of many Board Accessories available through Office Depot. Made by Safco.