High quality: the door stopper is made of excellent zinc alloy and rubber, durable, sturdy, can be used for a long time, the black rubber is soft, will not scratch your floor. > MAXIMUM HOLD ON THE FLOOR: The extra strong steel spring presses the rubber pad firmly on the floor. This guarantees maximum hold even with self-closing exterior doors (up to 16.6 kg pulling force). Holds the door open stably: the door latch with the spring and the soft rubber is good for keeping the door open, it can hold the door in your desired position. This spring force ensures that the door will be locked securely. No door shaking and no door rattling in the wind. FLEXIBLE POSITIONING: With the latchbolt with a 60mm throw, your door can be secured and released in any position with your foot. The doorstop can keep heavy doors open all the way or just a crack. Easy to Assemble: Assembly was done in minutes. The supplied drilling template was very helpful for pre-drilling the screw connection. Product