The Handler is a modular tool organizer that will help you keep your workspace clean and organized. I started the Handler System over 2 years ago and have consistently improved and added new items. The quick-changing pieces make your stack (compatible with several brands) more versatile than ever before. In the 20-piece set, there are 3 types of Handler Mounts - Top Mounts, Bottom Mounts, and a Wall Mount. The Wall Mount easily attaches to any flat surface while the Top and Bottom Mounts easily attach to the handle on your toolbox system. If you use Milwaukee Packout, Ridgid Pro Gear System 2.0, Dewalt Tough System 2.0, or Flex Stack Pack, we have Top and Bottom Mounts for your handle. Note: Ridgid 1.0 and Dewalt 1.0 handles will not work with the Handler System. After securing your mounts, customizing your setup with other Handler products is simple and fun. It only takes seconds to add, rearrange or remove Handler products. Keep the tools you need within reach and easily accessible with this 20 piece set. Products included in this set: 1 - Set of Top Mounts (2 connectors on each mount, 4 in total) 1 - Set of Bottom Mounts (2 connectors on each mount, 4 in total) 1 - Adapter Bar (increases handle mount connections from 2 to 6 and designed to accommodate 6 mini bins) 1 - Wall Mount (5 connectors) 1 - Tool Tray (15 holes of various sizes available and 4 additional connectors) 1 - Tray (solid tray and 4 additional connectors) 1 - Phone Holder (allows convenient charging from below and adds 2 connectors) 1 - Medium Bin 6 - Mini Bins (works well with Adapter Bar) 1 - 4 inch Cup 2 - Hooks 1 - 8 Bit Holder 1 - Flashlight Holder 1 - Marker Holder