Made a 6mm thick steel spinner complete with M10 coach screws, 2x M10 washers and 3 x 10mm M10 spacers. Screw in to a tree or post and blast away with the rimmy or .17 HMR. These spinners are suitable for rimfire ammo (including High-Velocity rounds) at 50m and .17 HMR at 100m. Reducing the range to less than this will result in marks on the steel.