TBC TROWELS: Professional Notched Margin Trowel 1/4" X 1/4" X 1/4" Square Notch. Tempered Steel Blade, Ground and Polished. Blade Size 5" X 2" For Professional and Home Use. NOTCHED TROWEL: 1/4 X 1/4" NOTCHED TROWEL MARGIN TROWEL BLADE SIZE 5X2" SQUARE NOTCH