DSLRKIT Pro Type 1/4"-20 Tripod screw to Flash Hot Shoe Adapter
This adapter can connect Shoe to 1 / 4 "-20 screw, this adapter have two nut.For example, using it you can install NIKON SC-28 FLASH Sync Cord to FLASH SHOE , or you can install YONGNUO CTR-301P Flash Remote Trigger to Flash Shoe this adapter can pile up  two camera.....