Quantity: 4Material: High Impact PolymerIncludes: 4 Safety Boot Units, Installation Instructions With Detailed Illustrations, 1 - 3/8" Drive Drill Adapter, 3/8" X 1-1/2" Fender Washer, Stress Engineering Report Summary And Fastener Specifications For Various Sub-Floor MaterialsSafety Boot Guardrail System Provides A Method For Constructing Versatile, Freestanding, Temporary Guardrail And Stair Rail SystemsExceeds OSHA Guardrail Regulations In Commercial And Residential ConstructionFully Reusable Safety Boot Features A Unique Design That Allows Toe Boards To Be Inserted Quickly And Easily For Complete OSHA Required Toe Board ProtectionAll Critical Stress Points Are Reinforced With A Double Polymer Thickness For DurabilityUses 2" X 4" Lumber For Rails And Posts (Posts Are Doubled)