Socket size for axle nut???

What size socket in metric will fit the axle nuts on an ’06 Rancher? I did a search and about 6 different answers were replied. I have an 1 1/8" wrench and it fit but a little loose, so what metric size would that be?
The search answers were 20mm, 24mm, 27mm, 30mm. Headed to the store and not wanting to buy that many sockets…