Compatible with all manufacturer's racks and stands. Constructed of extruded aluminum with polished chrome plate cast alloy wing knobs. Wing knobs are guaranteed for life. The entire clamp is warranted for 10 years. All Print-Lock clamps will hold 100 sheets or 20 pounds and come with "eye-ease" green color label holders. Dimensions are 18" (19 3/4" overall length).4301-6 Sold each or box of 6 Free Shipping Available only on a total Safco order of $750.00