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Professional Lightweight Support for Backdrops, Aluminum Alloy Construction for Durability & Portability2*2M:Good Flexibility with Width (4.6 ft.–6.9ft.) & Height (2.3 ft.–6.7 ft.) Adjustment2*3M:Good Flexibility with Width (4.9 ft.–9.8ft.) & Height (2.3 ft.–6.7 ft.) Adjustment2.6*3M:Good Flexibility with Width (4.9 ft.–9.8ft.) & Height (2.6 ft.–8.5 ft.) AdjustmentHolds Canvas, Muslin, Paper / Photo Clamps Provides Comfortable & Strong Grip to Prevent Backdrop Slip-out