The Cortag 61816 is a professional-grade notched trowel featuring a durable stainless-steel blade and an ergonomic open bi-component rubber handle. Designed for precision adhesive application, its 3 × 3 × 1/8″ (≈ 6 × 6 × 3 mm) square notches help create uniform mortar ridges, ensuring strong bonding for ceramic, porcelain, and stone tiling.