This is a homemade item for sugar gliders to sharpen their claws. Length: Approximately 135mm, Thickness: Approximately 25mm 4mm bolt & butterfly nut, washer specifications This is a set of 2. The items for sale are unused stock made after the initial creation. The file part is secured with cable ties, so it can be removed and used as a perch. Please refer to the images. Image 8 shows an example of it being used in my sugar gliders' cage, so I hope it will be helpful. *In the example of use by my sugar gliders (currently 15 gliders in 5 cages), there have been no problems so far, but use is at your own risk. Regarding the claw sharpening effect, sugar gliders do not always use the perch, and the gripping strength and force vary from individual to individual, but it is better than not having it installed in the cage. Please purchase if you understand that this is a handmade item.