Bobcat Bucket Teeth. The number on the bottom is GST520. These are 1080 carbon steel from a description I found a while back and measure about 7" long by 2" wide. The bolt holes are 1/2" and are 1 3/4" center to center. The forward most hole is about 1 3/8" from the center to what would be the edge of the bucket in the tooth. They will slip over 5/8" cutting edge. There is one brand new and the rest are lightly used with one having a little piece broke off. I no longer have a use for these so they are up for sale.