this is cuplock system,it includes up bottom,blade,down bottom!all these parts are forged,very strong !can be in every treatment Our company is a professional manufacturer and supplier of scaffolding and guardrails in China. Our products include scaffolding systems ,such as cuplock,layher,plettac,ringlock,kwik-stage,frame,guardrails and accessories,couplers, formworks, barriers, walk platforms, ...