This 8" groover features a bit that has a 3/8" radius and is 3/4" deep and 7/8" wide

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or at 15° for most angle stretching

48" Round End Blue Steel Fresno Trowel Blade Crain 247 Multi-Purpose Wall Trimmer This 8" groover features a48 in. x 5 in. Blue Steel Fresno w o Bracket measures 48 long x 5 inches wide. Fresno blade made from high quality tempered flexible blue steel. Use with a 2 hole bracket. 5" wide blade allows proper coverage and 1 2 In. square steel bar keeps the blade flat.