PC636 Extruded anodized aluminum clamps will hold up to 100 sheets securely without punching or stapling. Features: -Material: Aluminum. -Internal steel spring holds and open for easy loading. -Heavy duty chrome plated steel wing knobs open and close clamps. -Includes a spring to clip onto pivot brackets. -Includes snap-on clear plastic label. -Dimensions: 2" H x 38" W x 0.75" D.