Keyplate bull pin is generally used in railroad construction and steel frame construction to align bolt holes. The holes are aligned as the tapered pin is forced into them through the holes. The same method is widely used with bull pins to assemble heavy machinery, stage lighting trusses, and metal scaffolding. It prints the fine details of an image. The coloured inks used to print colour images with several ink colours typically do not have a lot of image detail. Keyplate bull pin provides the lines, contrast, or both of the image's components. this product is highly effective, easy to install and durable.