Block is pure copper spiral designed for use with our X-Aqua barebones systems. Block can also be used on any 3/8"" diameter water cooling system. All mounting hardware is included with the block, for attachment to socket 462/socket A. Block mounts via 4 through-board mounting holes on motherboard. If mounting holes are unavailable on your motherboard, you can still use the block but only via thermal transfer epoxy, such as our Nanotherm Epoxy. We recommend all users purchase a thermal compound below, or if in need, the thermal epoxy.