Includes a spring to clip onto pivot brackets. Snap-on clear plastic label holder. Extruded anodized aluminum clamps. 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. Chrome plated steel clip. 5 in. L x 3 in. W x 20.5 in. H (6 lbs.). 5 in. L x 3 in. W x 26 in. H (7 lbs.). 5 in. L x 3 in. W x 32.5 in. H (8 lbs.). 5 in. L x 3 in. W x 38 in. H (9 lbs.). 5 in. L x 3 in. W x 44 in. H (10 lbs.)