Simpson Strong-Tie WBSK Workbench & Shelving Hardware KitThe new WBSK Workbench or Shelving Unit Hardware Kit provides all the necessary hardware, fasteners and plans to build a workbench or shelving unit. The kit features the Simpson Strong Tie Rigid Tie RTC2Z corner connector that makes it easier to make strong and durable corner connections with 2x4 lumber using no angle cuts or bolts. Each kit contains enough RTC2Z connectors to construct one workbench. Two kits are necessary to build a four shelf unit.