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Designed for insulation contractors, the patented CenterFire Straight Blade fits into standard utility knife handles and most reciprocating saws. Twice the length of a standard insulation blade and the only one available without serration, eliminating dust and debris. Quickly cuts through foam and fiber batt insulation products like denim/bonded logic and fiberglass. The kit includes the CenterFire Straight Blade, an ergonomically designed handle, and a two-stage ceramic sharpener. A must have insulation tool for any contractor.