Amazon.com: 10pieces/lot M4/5/6 to M10, M8 to M10, M10 to M12/M14 threaded hollow tube adapter inner outer threaded coupler conveyer adapter - (M10 to M12, Zinc plated, Thread Diameter: 1.0mm pitch, Length:
10pieces/lot M6 To M10, M8 To M10, M10 To M12/m14 Threaded Hollow Tube Adapter Inner Outer Threaded Coupler Conveyer Adapter - Pipe Fittings - AliExpress
Amazon.com: WHY-YUE 1Pcs M8 M10 M12 M14 M16 M18 M20 Metric Female to Male Thread Brass Pipe Fitting Adapter Connector for Air Water (Size : F M10x1-M M10x1.5) : Tools & Home
Thread adapter M10 -> M8 / M8 -> M10 - MotoMoto
Uxcell M10 Male to M8 Female Adapter 10mm Long Sleeve Reducer Thread Reducing Nut Insert 5 Pack - Walmart.com
mirror thread adapter converts M8 left-hand to work with M10 left-hand mirror mount