This adapter permits the devices with standard 1/4" screw hole to be installed on flash hot shoe slot. It includes 2 nuts which can be adjusted. It can install NIKON SC-28 Flash Sync Cord to VH2 Camera Flash Bracket Grip. It can install YONGNUO CTR-31P Flash Remote Trigger to Flash Shoe Umbrella Holder Stand Bracket. This adapter can pile up two camera. Material: anodized aluminum metal 2 pack of 1/4" tripod screw to flash shoe mount adapter