Cosmos&reg; 4 Pack Adjustable Flow Rate Plastic Plant Watering Spikes Water Bottles Economical System (Blackish Green) Keep plants watered while you're away from home. Economical garden watering spikes. Fits most plastic water/soda bottles. Total is 10-3/4 x 2-3/8 inches; the length of the spike alone is 8-3/4 inches; the extra-long spike allows for the stable placement into the soil. Spikes come without holes, please drill some holes before use.