Amazon.com: 10Pcs Self Tapping Thread Inserts M8 x 1.25 Female and M10 x 1.5 Male Thread Extension Reduce Sleeve Conversion Kit : Industrial & Scientific
Amazon.com: 4 PCS 34inch Shelving Connectors, Threaded Pole Connectors, Shelving Post Coupler for Extending Wire Rack Shelving, None, Compatible with 34inch Poles : Home & Kitchen
Amazon.com: MECCANIXITY Thread Reducing Nuts Insert M12 Male to M10 Female Adapters 10mm Long Pipe Fitting Conversion Sleeve Reducer, Pack of 5 : Industrial & Scientific