Oatey 33856 Metal Stud Insulating Clamp, 50 in Polybag, 1/2-Inch Reduces water line noise and vibration when running water lines through metal studs. Hand tighten into place. 1/2"" size has 1/4"" and 3/8"" holes. Use on 18 gauge or lighter weight metal studs. No corrosion  made of durable polypropylene. Can be used on hydronic systems. Tabs for easy adjustment. Patent #6,598,835. UPC listed. Clamp design allows pipe to be flush mounted to walls and joists Minimizes the transmission of water line noise No corrosion - made of durable polypropylene (gray color) Ribbed design allows pipe to cool faster and expand/contract freely No corrosion - made of durable polypropylene