1、Paired with Phone Holder: This dovetail rail plate can easily secure your phone to an astronomical telescope, allowing you to use your phone to record while observing, freeing your hands. 2、Aluminium Alloy Material: The dovetail plate is precise manufactured from all metal aluminium alloy, making it easy to connect and disassemble dovetail plate without the need for tools. 3、Scope of Application: This aluminium alloy dovetail plate extends the use of the telescope finder scope base. It is suitable for telescope finder scope smartphone base expansion. 4、1/4 Inch Thread: The dovetail base provides a 1/4 inch threaded hole for connecting 1/4 inch telescopes, smartphones, photography tripods, etc. 5、Dovetail Rail Plate Function: This dovetail rail plate provides a platform for connecting the telescope to the bracket. Item Type:  Dovetail Rail Plate Material: Aluminum Alloy Weight: Approx. 35g / 1.2oz 1 x Dovetail Rail Plate 1 x Screw Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.