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