MARSHALLTOWN The Premier Line 23D 4-Inch by 5-Inch Inside Drywall Corner Trowel with DuraSoft Handle Lightweight tool made from one piece of flexible stainless steel with aluminum mounting Resilient DuraSoft handle with finger guard Blade set at a 103 degree angle that flexes to form a perfect 90 degree corner during use Used to embed tape and smooth out the final layer of mud to taped corners U.S. Patent Nos. 5,327,612 and 5,446,941