Tree climbing house sleeve used by arborists. Outer diameter: approximately 30mm, Inner diameter: approximately 19mm, Length: approximately 60cm Self-made product, new (Photos 1 & 2) Please purchase only if you understand that this is a self-made product. I have been using a similar product that I made myself, and it works without any problems. Other lengths are also available. Photos 3 and onward show examples of 40, 60, 80, 100, and 120cm. Prices vary depending on weight, materials, and shipping costs. The intended rope diameter is 13mm. Ropes with eyes will not pass through. To reduce shipping costs, it will be bent and packaged in a Yu-Packet, etc. Please understand.