The No. 420 is a1/16 open x1/16 flat x1/16 deep square-notched trowel. The front edge is angled back 10 for clearance when spreading close to the wall. The wooden handle is curved for comfortable grip. The handle bracket is welded to the spring steel blade. Add L to the No. 420 for left-handed model (i.e. No. 420L).