This Ring Flash Kit from DIYP offers a big-budget, sophisticated lighting effect often associated with high-end fashion photographs--in a very affordable form. This flash kit is compatible with select Nikon, Canon and Vivitar hot-shoe flashes, as well as others of similar size--the opening for the flash head is 2.755 x 1.575" (7.0 x 4.0 cm) and can be easily expanded. It can be attached to your flash head with gaffer's tape or using the optional Ring Flash Bracket, which also allows mounting the flash on a camera tripod socket. Assembly is required. A TTL cord is recommended.