Ultra Hardware 35593 Box of 2 4in Double Acting Spring Hinge-Steel Base-Black Finish

Are these rated for outdoor use?

The product description says Box of 2 but the Item Package Quantity says 1 at the 29.99 price how many hinges are included?

Could these be used on a 3/4 inch thickness door?

I have a 1 1/4 inch door between my living room and mud room, will these fit that type of door. Also, are there good instructions on how to install it