Qty 6 Hex Rod Coupling Nuts 1/4-20 x 7/8 Threaded Rod Connectors Zinc Coupler | eBay
Round Connector Nuts, Threaded Sleeve, Stainless Steel Coupling Nut, Coupling Nut for Bolts and Nuts Metal Bar for Threaded Rod (M8×12×30mm,2 pcs) : Amazon.co.uk: DIY & Tools