1/4" 3/8" 5/8" M8 M6 Male To Female Thread Screw Mount Converter Adapter Mic Bracket Stand Tripod Plate Slr Camera Accessories - Photo Studio Kits - AliExpress
M8 8mm MALE TO M6 6mm Female Threaded Reducers (Four) – Mnpctech
10PCS Thread ADAPTERS M8 8MM Male to M6 6MM Female Threaded Reducers Stainless Steel Fastener Accessory: Amazon.com: Industrial & Scientific
M8 8mm MALE TO M6 6mm Female Threaded Reducers (Four) – Mnpctech
Fitting Reducer Metric M8 M8X1.0 Male to M6 M6X1 Female Gauge Meter Bushing (2 Units)