got these wheels to use on a chicken tractor i built this way i can keep the chickens on fresh land weekly i use the wheels to basically turn the chicken coop into a wheel barrow of sorts to move about easily they do the job great
The surface is large enough, I glued it to the back of the head with a mammoth, I didn't want to drill (there could be 2 securing pins in reserve in case of loss)
Danny 
