This spiral flush trim Bit is used for acrylic, wood and MDF up to a 1/4" Thick, for getting into tight corners with a small radius and great for cleaning out your edges. Due to extremely small cutting diameter this bit is not guaranteed. Brass Pilot guide, #46196, direction: Up-cut, diameter (D): 1/8, cutting Height (B): 3/8, shank (D): 1/4, overall length (L): 2, type: Up-cut, 46196 Solid Carbide ultratrim spiral 1/8 dia x 3/8 x 1/4 inch Shank with brass Pilot guide Up-cut