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From the Manufacturer Red Head Boa Coil 1/2-Inch X 5-1/2-Inch Inch Expansion Anchor is a high performance expansion anchor providing through fixture fastening and easy removal to keep the job moving. It’s reusable with the coil replacement anchors making this anchor a low cost solution. Ideal combination of value, performance and reusability make the Boa Coil the choice for Forming and tilt-wall contractors. These Boa Coil anchors install easily through fixture installation and are removable. Reuse these coils up to three times in new holes. They have high shear strength, and are resistant to cyclic loading. The expansion coil locks into concrete to give cast-in type performance. Specs: Anchor Diameter - 1/2-Inch inch; Socket Size - 3/4 inch; Drill Bit Diameter - 1/2-Inch inch; Effective Length - 5-1/2-Inch inches; Fixture Thickness at Min. Embedment to be Fastened - 2-7/8 inch.