Dundas Jafine MC5ZW Metal Worm Gear ClampsDundas Jafine?ÇÖs metal worm gear clamps are ideal for use with semi-rigid or rigid aluminum ducts.?á They are made of heavy duty galvanized steel and are ideal for fastening ducts to aluminum pipes or elbows.Dundas Jafine MC5ZW Metal Worm Gear Clamps Features:; Heavy duty, all metal design; Excellent for use with metal ducting; 2MC3E: 3", 2 per bag; MC3Z: 3", bulk; 2MC4E: 4", 2 per bag; MC4Z: 4", bulk; MC5: 5", bulk; MC6: 6", bulkDundas Jafine MC5ZW Metal Worm Gear Clamps Specifications:; Description: 5?Ç¥ Metal Worm Gear Clamps; Pack Type: Retail Bulk; Pack Qty: 50