Durable, strong, easy-to-use fastening clamps used to attach overhead stirrers to their stands. Includes a convenient place to hold chuck key. The cast zinc-aluminum alloy is coated for protection from corrosion and chemical spills. A120 Fastening Clamp (Cat. No. 330-58153) accommodates 1/2 in. (12. 5 mm) stirrer support rod and up to 25 mm (1 in. ) stand rod. A122 Fastening Clamp (Cat. No. 650-10534) accommodates 5/8 in. (16 mm) stirrer support rod and up to 25 mm (1 in. ) stand rod.