Keep flowers flourishing with the DIY Bottle Drip-Irrigation System Automatic Watering Spike Can be attached to any plastic bottle with an inner diameter of 1.1" A DIY way to keep your plants watered when you aren't home Just turn the screw to stop or start the water flow Material: PVC Dimensions: 135mm x 35mm x 35mm Choose from a pack of 6 or 12 watering spikes   Buying Options: 6.99 pounds instead of 19.99 pounds for a 6-Pack - save 65% 12.99 pounds instead of 19.99 pounds for a 12-pack - save 50%