Manufactured in Vietnam, the HJ-1 (D-S1) metal joint connector is designed for fast assembly of modular rack systems, trolleys, and worktables using Ø28mm plastic-coated steel pipes or Ø28mm stainless pipes. The connector set combines two D-S1 joints secured by an M6 bolt and nut, enabling quick installation, repositioning, and durable performance with either zinc-plated or black powder-coated finish—ideal for importers and project buyers sourcing standardized industrial fittings for repeat orders and export supply. Product Dimensions: