4.25in Dovetail Plate: Dovetail plate allows you to connect multiple accessories including telescope rings, telescopes, and cameras. It can also be used for attaching telescopes with tripod adapters. 1/4in Thread: The adapter offers a threaded post for attaching instruments, such as standard photographic tripods equipped with a 1/4in socket. Easy to Dismantle: The adapter is made completely oxidized and precisely manufactured from full metal alloy, and can be easily connected and dismantled without tools. Dovetail Plate Function: The dovetail plate provides a platform for attaching telescope optical devices to an equatorial mount, and for securely attaching an oscilloscope to an EQ mount. Excellent Accessory: The dovetail plate is an excellent accessory for EQ mounts and DSLR or SLR cameras to take photos of the Star Road.