You ever see non-stainless steel tools when they have been exposed to salt water environments? Not a pretty sight. It also looks bad when you pull out your rusted open-end steel 9/16 x 11/16" to remove or replace a standard 9/16" or high flow 11/16" second-stage hose. Many of the new low-profile designed hose fittings may not even allow you to use a standard wrench. Look professional when you have to do dive gear repair or maintenance by using a clean and easy to maintain stainless steel dive wrench that is thinner than standard tools and allows you to get into those tight spaces. Wrench makes a great gift for that diving significant other or friend. Why not get one for both of you!