I manage properties and often give out keys. These rings are definitely strong, which can sometimes break nails, but I'd rather have that than lost keys or a broken o-ring. The flat shape makes it very difficult to bend, so you don't have to worry about bending the ring because you ripped it off when the key got stuck. Because the o-ring is flat and wide in one direction, it can be difficult to fit some wrenches if they have a very small head hole, but I've had no problems.
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