You are buying one 19/64" drill bit specifically designed for drilling of plastics.
These drill bits have a zero-degree rake, a 60- degree point, and parabolic
cutting flutes to drill through Plexiglas, and acrylic plastics without binding
or " breaking out ". Very low torque and kickback means that you can
confidently use it with a hand drill without any fear of the drill binding
or wandering.Perfect for the use with Acrylic,Lexan, Polycarbonate,
and other plastics.