It has 4 small holes and bundling through these small holes is more stronger and efficient than four corners. Its automatic buckle design makes it more convenient to install or disassemble, which can be completed by one person. This plant rooting box has increased the diameter of water inlet to facilitate watering. Designed with observation port, the branch can extend from the observation port, and you can use black tape to seal when not in use as prolonged ventilation will affect the rooting time. Made of high-quality PP material, the plant rooting box is durable, wear-resistant and sturdy for long-time use. There are 3 sizes for you to choose from S, M and L. You can adjust the box bottom reasonably according to the branches' diameter. It is suitable for garden grafting, rooting, plant growing as well as breeding. Item Name: Plant Rooting Box Material: PP Color: Black, White Features: Nice-looking, Ornamental, Eco-friendly Size Details: S Diameter: 5cm/1.97", Suitable Branch Size: 3mm - 9mm/0.12" - 0.35" (Approx.) M Diameter: 8cm/3.15", Suitable Branch Size: 7mm - 12mm/0.28" - 0.47" (Approx.) L Diameter: 12cm/4.72", Suitable Branch Size: 12mm - 31mm/0.47" - 1.22" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Plant Rooting Box