Countersinki..

#8 Smart Edge Head Replacement Bits 5/. Sub Brand: Smart-Bit. Countersink Size: #8. Material: Stainless Steel. Stem diameter: 3/4 in. Shank Type: Hex Shank. Number in the package: 5 units. Product Type: Replacement Bit. Countersink Angle: 60 degrees. Drilling depth: 1-1/8 inches. Use: pre-drilling and countersinking tool. Type of packaging: carded. Overall length: 0.125 inches. For use with: Ace No. 2695039.
Is Discontinued By Manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 4.7 x 0.2 x 3.5 inches; 0.8 ounces
Item model number ‏ : ‎ Bda161
Date First Available ‏ : ‎ February 10, 2011
Manufacturer ‏ : ‎ STARBORN INDUSTRIES
ASIN ‏ : ‎ B004AQ4RJK