1、9 inches of chain is more than enough for working, and it is adjustable for loosening and tightening. 2、Thanks to heat treatment, the high-quality steel has excellent hardness up to HRC60. 3、This chain wrench fits up to 6.1 inches in diameter, so it works perfectly as a filter tool, pipe fitting tool, etc. 4、The firmly connected chain ensures strong holding and gripping, which promises perfect working performance. 5、The coating material makes the wrench more durable and also prevents it from rusting.