PrimeSource Building Products Inc. is one of the largest purveyors of fasteners in the world and the largest distributors of building materials in North America. The firm's proprietary product lines include the Grip-Rite family of products and Pro-Twist Construction Fasteners. Its 35 distribution centers throughout the United States and Canada carry a wide range of building materials from industry leaders, such as Owens Corning, National Gypsum, Henkel Corporation, Hitachi Power Tools and CertainTeed, among others. The firm is a member of STAFDA (Specialty Tools & Fasteners Distributors Association), AWCI (Association of Walls & Ceilings International) and AHMA (American Hardware Manufacturer's Association), to name a few.