Cast aluminum alloy mounting is securely attached with rivets to the tempered steel blade. The hardest blade available, making them last longer. Notch style and size help to control depth and amount of adhesive applied. Used to spread adhesive or mastic on the base surface before laying tile, carpet, or other floor coverings. Resilient DuraSoft handle provides a soft feel, reduces fatigue, and offers excellent durability. Notch depth 1/4", Notch width 3/16".