Description: This dovetail plate is crafted from metal, ensuring longevity and reliability for your astronomical telescope needs. Its narrow rail size of 43.4mm facilitates quick disassembly and assembly of the main mirror tube. The design includes a convenient locking mechanism where the screw head can be pulled out to adjust the wrench direction, alongside an M8 screw hole for adding a counterweight if necessary. With dimensions of 205x102mm (8.07x4.02 inches), it's compact and easy to handle, perfect for converting wide rail telescopes to narrow rails for equatorial mount compatibility. Size Chart: 20.5cmx10.2cm/8.07inchx4.02inch Package Includes: 1 Wide to narrow dovetail adapter plate Note: Please allow slightly errors due to manual measurement and different monitors.