- Wooden door thickness: 50–90 mm
- Lock center distance: 60 mm or 70 mm (if greater than 70 mm (e.g., 100 or 120 mm), an additional front-and-back steel plate is required, approx. $600.)
- Gap between iron/metal gate and wooden door: Minimum 80 mm required.
- Original lock body size: 240 mm × 24 mm; using other sizes will incur an extra fee of approx. $200.
*Metal surface processing fee: If the lock position involves a metal surface, an additional charge of $400 applies.
*All above extra charges are for reference only. Final pricing will be based on the quotation provided by Shun Hing installation technicians.
Please refer to the measurement guide diagram for detailed instructions.