Powers Fasteners- 2722SD Tapper Hex 1/4" X 1-3/4" Screw

Concrete Anchor Screw, PK100 Item: Concrete Anchor Screw, Type: Self Threading, Head Style: Hex Washer, Material: Carbon Steel, Anchor Dia.: 1/4", Length: 1-3/4", Drill Bit Size: 3/16", Application: Window Installations, Interior Hand Rails, Wood to Concrete, Storm Shudders, Package Quantity: 100

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http://www.powers.com/pdfs/mechanical/tapperplus.pdf