Product Description: M8 Replacement cat scratching posts with Screw for cat scratcher post, cat tree, cat tower or DIY. Our refill cat scratching pole is compatible exclusively with M8 screws. Before Purchasing, kindly ensure that your cat tree/cat post uses screws with an 8mm(M8) diameter. FUNCTIONS - Replacement cat pole for cat scratching post, cat tree, cat tower or cat scratcher DIY. Choose SVD.PET refill jute rope post, save time of winding the rope yourself. PREMIUM QUALITY - 100% natural jute rope (5mm bold). The ropes are tightly wound and securely reinforced with pet-safe PVA glue on a pole, ensuring no loose ropes even under vigorous scratching. USAGE SCENARIOS - Use this refill part to replace the worn out post of your cat tree, or use the included double-headed screws to connect two alternatives to achieve higher heights. SCREW COMPATIBILITY: Our refill cat scratching pole is compatible exclusively with M8 screws. Before purchasing, kindly ensure that your cat tree/cat post uses screws with a diameter of 8mm (M8). Refer to the image online for how to measuring screw size. DIMENSION & PACKAGE - Two 17” x 2.95” jute rope posts , three M8 screws