Includes 5 tough cases (small) and 4 bulk cases with storage slots for storing and transporting small items such as electric tool bits and more Push-lock mechanism to keep case securely in place Compatible with 12 types of tool box "TSTAK" series (*TSTAK's DWST83343-1, DWST83344-1 cannot be connected) Compatible with Tough Case (Large) (only if you place the Tough Case on top) / Carry handle for easy carrying with one hand Size: W17.2 x D12.2 x H4.7 inches (W437 x D310 x H120 mm), Weight: 2.93 lbs (1.33 kg), Material: PP