For 1/2" copper or polypipe tubing in 1-11/32" or 1-3/8" hole. Eliminates rattle & electrolysis and protects tubing from sharp edges of metal studs, 18 gauge or lighter, by isolating the tubing from the metal stud. Offset hole makes for better pipe alignment. Made of tough durable polyethylene. Withstands temperatures of 140 degrees Fahrenheit. Also available for 3/4" tubing as part #750P and 1" tubing as part #1000P. Contact us for large quantity discounts and wholesaler pricing. Quantity: 100 per bag. Minimum quantity 1 bag.