(ICA2-1, ICA4-1) Columbia Inside Corner Applicators are all machined from solid aluminum billet. They are very accurate and their Delrin wheels glide along the wall. Offered in two and four wheel designs. FEATURES: The one way model is offered with two wheels or four wheels Hand made from U.S. aluminum and steel components Machined in our state of the art facility in Canada DOWNLOADS: 2 WHEEL INSIDE CORNER APPLICATOR SCHEMATIC 4 WHEEL INSIDE CORNER APPLICATOR SCHEMATIC