A Pair Drywall Corner Tool,Inner Outer Wall Corner Trowel Plastering Tool Perfect 90 Degree Right Angle when Mudding Drywall Plastering Around the Groove - Amazon.com
QLT by Marshalltown 11-in x 4.5-in Steel Drywall Trowel in the Trowels department at Lowes.com
Marshalltown 14-in x 5-in Golden Stainless Steel Drywall Trowel in the Trowels department at Lowes.com