The Lumax 2-pc Strap Wrench Set, No. LX-1819, offers a flexible strap designed to fit any shape filter and avoid surface damage. The strap is non-slip, industrial strength, rubber and built for durability. The large filter wrench has a range from 1" to 6-1/2" (25mm to 165mm) in diameter. The small filter wrench has a range from 3/8" to 5-1/4" (10mm to 133mm) in diameter.