- A brand of the Chicagoland-based Minerallac Company, the Black Claw™ line features premium fasteners constructed from high carbon steel to ensure a tight, secure ''claw grip'' on flanges, conduit, cable, studs and T-Bars. These products hail rave reviews from contractors for their strength and efficient installation. Strong, swift and efficient, Black Claw™ fasteners are some of the finest spring steel fasteners on the market. The Black Claw™ brand includes various conduit clips, strap hangers, beam clamps, metal stud fasteners, acoustical products, voice/data products and related hardware accessories for the construction and electrical industries.