Festool 576835 Router Bit Systainer3 SYS3-OF D8/D12 is designed to store, organize, and transport up to 40 router bits efficiently. It is specifically made to hold 8mm (5/16") shank bits and 12mm (15/32") shank bits securely. While 1/4" shank bits can be stored with a loose fit, 1/2" shank bits fit more snugly for added protection. This system helps keep your router bits protected and easily transportable. The Systainer can also be latched to others, allowing you to transport multiple units simultaneously with ease. Model Number: 576835