The CAMVATE 1/4"-20 Female to 3/8"-16 Male Adapter features a 1/4"-20 female thread on the bottom and a 3/8"-16 threaded screw on top. It allows you to convert a 1/4"-20 screw to a 3/8"-16 screw or, vice versa, a 3/8"-16 female thread to a 1/4"-20 female. It's made of stainless steel and can be used for camera plates and various other accessories.
UPC: 619125203502