My shooting range is all uphill and there’s only trees to mount targets on, so I weld heavy wire to the target and wrap it onto the tree lol. Works great. I had to replace my 12 gauge steel spinners because they finally got too bent up. This time I used 1/4 inch plate, and I think it’s going to hold up. The largest disk is one inch and the smallest one is a little bit smaller than a .177 pellet. I’m going to make one for 60 yards and one for 100 yards. Spinners are just so much fun, a perfect hit sounds so completely satisfying lol! I shoot from the window in the trailer, the 100 yard target is even more uphill! Still I’m really lucky to be able to do this.