1/4" Square Drive to 3/8" Socket Increasing Flat Adaptors | BAHCO | Bahco International
Adapter, Brass, Compression, Female, 7/8 x 3/4 In. | True Value
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