Specification: Item Type: Self Watering Spike Material: Plastic Product Size: Approx. 15.8cm / 6.2in Top Outer Diameter: Approx. 2.1cm / 0.8in Weight: Approx. 110g / 3.9oz Use: Drip, Plant Watering Seepage Device Applicable Bottles: Cola Bottles, Mineral Water Bottles, Beverage Bottles Application Scenes: Vegetables, Potted Plants, Indoor Plants, Water Plants Daily, Garden Plants, Herbs, Hanging Baskets, Table Pots, Hanging Flowers, Outdoor Gardens, Small Trees, Shrubs Package List: 4 x Blue Self Watering Spike, 4 x Green Self Watering Spike Note: Manual measurement, please allow slight variations. Features Practical Tool: The self watering spike is a garden watering device, a convenient tool that helps deliver water to plants where they need it most. Wide Application: Automatic watering spikes have a top outer diameter of 2.1cm and are suitable for most cola bottles, mineral water bottles, and beverage bottles. Easy To Use: Simply screw the head of the self watering spike into a full bottle of water and insert the tip directly into the soil near the stem of a potted plant. Delivers Nutrients: You can mix water and plant food in one bottle and then use the drip irrigator to deliver a nourishing solution. Application Scenarios: These irrigation spikes are suitable for vegetables, potted plants, houseplants, patio plants, table pots, outdoor gardens, and more.