Maybe it just depends on what size bolts you're going to use to mount it. The hole saws are great, as the other guys mentioned, but when I bought my toothbar, it was going to be mounted to the bucket with 5/8" bolts, I didn't have a hole saw of that size, but I sure did have regular drill bits in 5/8" and 3/4" sizes, so I just put the toothbar on, took a punch to mark the middle of the hole where I wanted the bolts to go and drilled the two holes. Then I put a large washer on the bolts, inserted them from the outside of the bucket into and through the holes in the bucket and toothbar, added another washer and a nut. Some folks mount the bolts from the inside hoping, at least, to keep the threads cleaner, but I wanted mine from the outside, so the only thing sticking out beyond the end of the bucket was the bolt head. Either direction works.