Havahart Cage Trap Model-1025 Traps Rats, Weasels, Chipmunks and Flying Squirrels.

Easy to bait, set and release, this high tensile wire mesh trap is steel reinforced for long life and maximum resistance to damage. The smooth inside edges are for the protection of the animal, while the spring-loaded doors have sensitive triggers to ensure a quick, secure catch. This model comes fully assembled

17.5 x 5.25 x 7.25.

The following are good bait suggestions for trapping squirrels.
Cereal
Grains
Nuts (especially peanuts)
Sunflower seeds
Anise oil (a drop or two on bread)
Shelled corn
Apples
Mixed peanut butter and oatmeal
Peanut butter and molasses popcorn.

Almond extract on bread has also been said to be very effective by some trappers.