Very good quality, design and price. Depending on the power of your tools, is whether youll need to go instead with a long deck screw or similar. They offered a free replacement. Only problem is she can not say butterfly ?? so everyone has to admire her Buttfly shoes. I bought my first one a year ago. I may get a second one and stand them side by side. I have it mounted horizontally but it can be mounted vertically. They are super comfortable, lightweight, and breathable. 5 or 12, depending upon the style of shoe. Tremor causing my typing skills to go from 80+ WPM with 100% accuracy to under 20 WPM and 20%+ error rate was very frustrating.