Dia. Of cut: 3/16" to 35/64". 1/4" shank. 100 degree cutter. High Speed Steel. The "zero flute" design is a single hole drilled through the head of the cutter, which makes it virtually chatter-free. And since it has no flutes to shift inside the hole, the cutter always stays on center. Fits any drill with a 1/4" chuck. 1 lbs (0.5Kg) shipping weight.