Size Reference : 9Pcs perforated measuring templates in 3 widths of 25/18.5/12.5 mm (1/0.7/0.5 inch), 3 pieces of each width, length 22.8 cm/9 inch, hole diameter: 3.5 mm, evenly spaced. Quality : The perforating tools are made of high quality acrylic, sturdy and durable, not easy to break or deform, can be used for a long time. Assistive Tool : Transparent punching ruler is processed with high precision, the holes are accurately positioned and evenly distributed, suitable for a variety of punching needs Wide Application : Acrylic punching ruler is suitable for all kinds of leather straps, which is convenient for you to carry out many types of pattern punching process, making dog collars, belts, waistbands and so on. High Transparency : Transparent acrylic material makes the punching ruler visible, you can clearly see the location and size of the punched holes when you use it to improve the accuracy.