Simpson Manufacturing Co., Inc. is primarily a holding company. Through its subsidiary, Simpson Strong-Tie Company Inc. (SST), the Company designs, engineers and manufactures wood-to-wood, wood-to-concrete and wood-to-masonry connectors, SST Quik Drive screw fastening systems and collated screws, stainless steel fasteners, and pre-fabricated shear walls. SST Anchor Systems offers a line of adhesives, mechanical anchors, carbide drill bits and powder actuated tools for concrete, masonry and steel. SST is the Company’s connector products segment. The Company’s subsidiary, Simpson Dura-Vent Company, Inc. (SDV), designs, engineers and manufactures venting systems for gas, wood, oil, pellet and other alternative fuel burning appliances. SDV is the Company’s venting products segment. SST’s Anchor Systems product line is included in the connector product segment. In January 2009, the Company acquired the business of RO Design Corp, doing business as DeckTools.