Hot Rolled Steel Square Tubing, ASTM A-36, 1" x 1", 0.065" Wall, 12" Length

Hello i need a 2-inch standard receiver tube. i want to make sure the inside of this square tube can accomodate 2" x 2" shank?

Is this good steel to use with a flux core welder

Is it shipped by UPS or FedEx or USPS?

is size id or od?