Installed without drilling? Yes, both velcro and drill holes can fixed the screen door. Velcro and screws will be provided in the installation package, it's all up to your own needs. Can I lock the door? Of course, but you can't use a lock with a key, you can use a latch that can be opened from the inside and cannot be opened from the outside. Is this removable? Yes, you can remove and reinstall fairly easily. If you make a mistake while installing, you can simply remove it and reinstall it. Is the sill plate necessary? Yess, for proper operation, the sill plate must be installed. Can handicapped pass? Yes, the screen door uses a 1.2cm lower track to ensure children, the elderly, and the disabled are guaranteed to pass when using strollers or wheelchairs. Size Measurement Note？ The product has very high dimensional requirements when installing, please measure and select the size you need carefully to avoid returns without quality problems. Range of customization？ The width of the custom screen door is from 25 to 96 inch, and the length is from 75 to 96 inch. When the width exceeds 55inch, we default to the screen door as a two-way door. Is it waterproof? Yes, our blackout fabric can be waterproof, moisture-proof, mildew-proof, anti-aging, light filtering fabric moisture-proof, mildew-proof, anti-aging. Open in both direction? Yes, the MaKefeile accordion retractable door can be opened to the left or right, and can be installed according to your needs. Can pets be stop from pass？ It can prevent small pets from passing through, such as cats, and it cannot prevent large pets from forcibly passing.