Aquabay M4 HDD Waterblock Aluminum cover dissipates heat more instantly than other HDD waterblock with acrylic cover For 5.25 drive bay - The HDD waterblock can fit into 5.25 drive bay in the chassis Excellent heat dissipation through copper tubes and copper base Support all 3.5 inch disk driver Can be applied to ID 1/4 inch (6.4mm) and 3/8 inch (9.5mm) liquid cooling systems