Check the listing for details. Columbia Drywall Inside 90 Corner Compound Applicator Head with Wheels. Condition: New. Listed at 108.00 USD. Columbia Inside 90° Applicator with Wheels Columbia Inside Corner Applicators places a very nice bed of drywall compound for your tape coat. They are all hand assembled and machined from solid billet aluminum. It has 4 Delrin wheels that allow it to glide very smoothly along the wall. Attach to your Corner Box, Compound Tube or MudRunner. (sold separately) FEATURES:Hand made from U.S. aluminum and steel componentsMachined in CanadaAl's Taping Tools is the Largest Drywall Tool Store in the World! We are also a fully equipped automatic drywall tool service center with over 30 years in the industry. We service all major brands. All of our service techs are also fully trained in the operation of the tools that we sell and service. So if you are new to automatic drywall tools or have any questions please give us a call. Al's Taping Tools & Spray Equipment815 Tower DriveMedina, MN 55340