The product is #10 Counters 3/16" Bit. Easy to use. The product is manufactured in China.
The DeWalt countersink with tapered drill bit is ideal for fine-wood drilling and provides you with superior speed while leaving an ideal finish. Using a four-cutter countersink and 3/16-inch drill bit, this product is uniquely designed to allow you to drill, countersink, and counterbore all in one step. Replacement tapered bits are available.

DeWalt DW2569 #10 Countersink with 3/16-Inch Drill Bit