The small one can be used to open lids in jar cans.
These wrenches of both size isn't strong enough. When I try to turn, the strap gets extended. So it never loosen something tight.
I bought this set for loosening the oil filter of mostly european cars. I didn't want to damage or scratche on the cap of oli filter. Because the strap is made of rubber I believed it worked as I thought. But it doesn't.
This concept and idea is really great. It works in the kichen when you open a jar of sauce or something. But this set is not a tool for auto mechanics.
These worked better getting an arc oil filter off the the pen wrench