Compatible with 16mm OD Poles - Designed for 16mm outer diameter metal poles, 16mm CPVC pipes, and some 16mm garden stakes. Ideal for repairing greenhouse frames or building lightweight structures. Note: not compatible with 1/2” PVC Schedule 40 water pipes. Made of Durable PP Material - Constructed from high-quality PP material, featuring thick walls, better aging resistance. They are designed to withstand impacts, can withstand heavier weights and improved durability compared to regular PVC plumbing fittings. Easy to Install & Tight-Fit Connection - Reinforced structure ensure a snug, stable connection. Fits securely without wobbling. Ideal for edge, corner and center connections Multi-Purpose 4-Way Elbow Connectors - Perfect for building greenhouse frames, tomato cages, garden shelves, pet beds, light boxes, DIY furniture, craft projects, small tents, storage racks, and more. Great replacement for broken connectors on mini greenhouses. Pack of 10 Connectors + More Type Available - Each pack includes 10pcs 4-way 16mm connectors, ideal for greenhouse repairs and DIY projects. We also offer matching 4-way, 5-way and other connector types, allowing you to mix and match freely for more complex structures.