K&M 21900 THREAD ADAPTER Female 3/8 inch thread, male 1/2 inch thread
Foleto New 3/8 inch Female to 1/4 inch Male Tripod Thread Reducer Adapter Brass Copper For Camera tripod Diameter of screw 6mm|1/4 inch|for cameratripod tripod - AliExpress
Universal Socket Adapter (3/8-Inch) - RobotShop
1/4 Inch to 3/8 Inch Convert Screw Adapter for Tripod Holder – Prophotographygear
walimex pro Thread Adapter 1/4 on 3/8 inch brim | walimex-webshop.com - walimex-webshop.com
Buy Brass Pipe Fittings, Water Hose Adapter, G 1/2 Female to G 3/8 Male Reducer Adapter, Compression Fitting for Kitchen Bathroom Faucet, Pipe Connector with Rubber Washer,(2 Pack) Online in Japan. B094819VH9
3/8" FNPT X 3/8" BSPP Male Brass Adapter (NPT X BSPP)
Windtech M-16 Microphone Thread Adapter - 3/8 Inch-16 Female to 5/8 Inch-27 Male | Location Sound
CRAFTSMAN 3/8-in to 1/2-in Socket Adapter in the Socket Adapters department at Lowes.com