Description Introducing our lineup of extension organizers! The starter set includes the larger “head” side to fit the drive side of (6) chrome extensions of each size (1/4″, 3/8″ and 1/2″) as well as the required shaft supports. Our MagAttach holders feature magnets on each side to interconnect with our full line of MagAttach magnetic interconnecting holders. We have also put magnets in the base to prevent them from sliding around when drawers are opened and closed. Each extension holder support also features two base magnets. Dimensions/Fit: Our extension organizers are designed to fit 90% of chrome extensions on the market. To ensure they fit yours please review the dimensions in the image below: Notes: *3D printed parts do vary slightly from piece to piece. ** Tools shown in images are NOT included. This is for the tray ONLY.