Usage Tips:Integrated Design: Features a seamless anti-light-leaking design suitable for both 1.25inch and 2inch filters, enhancing astrophotography experience Magnetic Locking: Utilizes a double magnet system for secure and easy installation, eliminating the need for repetitive screw adjustments Versatile Compatibility: Compatible with standard 1.25inch and 2inch filters, ideal for both novice and experienced photographers Telescope Integration: Easily connects with SV550/SV503 OTA and compatible astronomy cameras via included M42-M48 adapter Optimal Thickness: 21mm thickness maintains optimal back length for superior imaging quality Product name: Filter drawer Thickness: 21mm Supported filter size: 1.25inch & 2inch Material: Aluminum Camera side thread: M42 x0.75 (male) Filter mounting thread: M48x0.75/M28.5x0.6 (female) Telescope side thread: M48x0.75 (female) Colour:Black Package Contents: 1 x Drawer Rack 2 x Filter Sliders 1 x Filter Adapter 1 x M42f-M48m Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.