GEWINDEEINSATZ- Set 10 / 20–Piece 1.5 × D HELICOIL M8 : Amazon.de: DIY & Tools
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
10PCS Thread ADAPTERS M8 8MM Male to M6 6MM Female Threaded Reducers Stainless Steel Fastener Accessory: Amazon.com: Industrial & Scientific