Product Overview This spacer adapter is designed to solve the problem of not being able to install commercially available door closers properly due to steps in wooden door frames. Optimized for Audiofan automatic door closers, but can also be used with other models. Available on Amazon, search for ASIN: B08X44Y2BM. Features Fits upper and lower steps (10mm each) → Ensures a horizontal mounting surface for the stepped structure of the wooden frame. Complies with the width of commercially available door closers → Compatible with 63mm square wire-pull type door closers Double-sided tape attachment Please prepare double-sided tape separately (3M strong type recommended) Bonus For those with 5mm screw holes located 48.5mm square, you can increase the strength by using the included pins. This is the hole position for the Audiofan automatic door closer. Beautiful integration with the mounting part → Compact design unique to 3D printing, suppressing the feeling of being added later Dimensions Step depth: 45mm Step adjustment: 10mm each up and down (adjust with the thickness of the double-sided tape) Material: PLA Color: White Fixing method: Please prepare double-sided tape separately, 3M strong type recommended ⚠ Notes This product is optimized for "wooden frames (10mm step)" Door closer body is not included Light processing (pilot holes and alignment) is required for installation