1. Effectively prevent leaves, branches, debris and debris from falling into the drainage pipe. 2. Effectively prevent possums and parasites from breeding in roof drainage pipes. 3. Effectively prevent from entering the house and making maggots inside. 4. Helps the drainage pipe to accumulate too much water and overflow. 5. Effectively prevent snakes from staying in the drainage ditch. 6. Effectively reduce mosquito parasites. 7. Effectively help to filter out floating objects on the water. 8. Extend the service life of the drainage pipe. 9. Easy to install, you can DIY by yourself and have . Material:Metal colour:Silver Package Contents: 4 x Drainage Filter Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.