Marshalltown 718SD 11" x 4-1/2" Notched Trowel with DuraSoft Handle - 1/4" x 1/4" 'U' Notched (15733) 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 Notch width = 1/4", Notch depth = 1/4", Space between notches = 1/4" Resilient DuraSoft handle provides a soft feel, reduces fatigue, and offers excellent durability