For Products with Only Standard 1/4 "Screw Holes at the Bottom, Such as Cameras, Nikon SC-28 TTL Cable, Yongnuo Ctr-301p Wireless Flicker, When They Need to Be Installed on Devices with Hot Shoe Jacks, you Can Use This Product to Add a Hot Shoe Socket. It Is Convenient to Connect Two Cameras Together, Install TTL Wire on L-Type Bracket, Or Fix Yongnuo CTR-301P on Type B Socket, and Then Install Flash Lamp. The Enhanced Version Is Equipped with Double Screws, Which Can Be Locked up and down. and the Screws Are Larger than Small Size, More Durable, Convenient and Practical!