1/4'' to 3/8'' screw thread converter-adapter | TeleprompterPAD.com
Threading Adapter, NPT 1/4 Female to NPT 3/8 Male
1/4" 3/8" 1/2" 3/4" NPT BSPT Male to Female Thread Brass Reducer Bushing Reducing Pipe Fitting Coupler Connector Adapter - China Parker Tube Fittings, Hydraulic Tube Fittings | Made-in-China.com
Amazon.com : Camera Screw Adapter Thread 1/4" Male to 3/8" Female and 3/8" Male to 1/4" Female Adapter Set for Camera Monitor, Tripod, Mount : Electronics
4pcs Durable Male to Female Screw Adapter 1/4" 3/8" Mount Set Thread Screw Adapters Convert for Camera Tripod Light Stand - AliExpress