Honbay 4PCS 1/4" Male -3/8" Male Converter Screw +4PCS Female 1/4" to Metal 3/8" Convert Screw Adapter for Tripod Monopod Ballhead DSLR SLR 100%Brand New and High Quality This is a universal adapter spigot stud for the studio use 4PCS 1/4" Male -3/8" Male Converter Screw 4PCS Female 1/4" to Metal 3/8" Convert Screw Adapter Easy to add and remove by hand,Perfect for putting two photo equipment devices together