These two files should be helpful in sizing up Sure-Grip products. Please understand that boot sizing is not consistent or exact. One brand’s boot could be sized a little different, the heels could be angled a little different (especially with artistic boots), and that these size charts are just a starting point. If possible, use the measurement chart first, that is going to be more precise. If that doesn’t work, then use the sizing chart, but understand that it is just a guide. Don’t drill a boot (or ask someone else to do so) based solely on this chart. Look at how the specific plate sits on the specific boot you’re working on.
Double Action 45 Degree Invader Chart – this plate is designed for the derby market skaters, and the sizing is for the skaters that prefer a “short mount” option. These plates will be shorter than what is normally used, but a lot of the derby skaters are preferring it this way.