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# Crain Tools No. 1555-G Three-Arm Kno The Crain Tools No. 1555-G Three-Arm Kno is a professional-grade installation tool engineered for precision flooring work. Its three-arm design distributes force evenly, reducing strain while delivering consistent, controlled results on hardwood and engineered wood installations. Built with durable construction to withstand demanding job site conditions, this tool is an essential addition to any flooring contractor's arsenal. Trusted by professionals for reliable performance and longevity.