Extruded anodized aluminum clamps will hold up to 100 sheets securely without punching or stapling. Internal steel spring holds clamp open for easy loading. Heavy duty chrome plated steel wing knobs open and close the clamp. Chrome plated steel clip includes a spring to clip onto pivot brackets. Includes snap-on clear plastic label holder Clamps available in 18", 24", 30", 36" and 42" lengths and are sold in cartons of six. Clamps are compatible with all other major manufacturers' products.