Conical, two flute construction drills burn-free holes
from 1/8" to 1-1/8" diameter in metal, plastic,
or wood. A washer can be placed on cone to act as a simple
stop-gauge. Ideal for sheet metal and hole enlarging work.
Tapered Cone Drill - High Speed Steelpage 118Tapered Cone Drill - TiN Coatedpage 118