Husky 1/4 and 3/8 in. Drive Adapter Set (3-Piece) HADPTR3PC - The Home Depot
K&M 1/4" to 3/8" Thread Adapter 21770.000.29 B&H Photo Video
1/4" NPT Male x 3/8" NPT Female Swivel Straight 1404-04-06 Adapter | NPT Female Swivel to NPT Male - Straight | NPT to NPT | Hydraulic Adapters & Fittings | Hydraulics | www.surpluscenter.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