With the head part and the anchor part being separated, the operation using the product can allow the more flexible 48 degrees of ROM (Range of motion) of the anchor.The head partis designed in a compact way, making it easy to use and less burdensome for the patients after operations. AEGISII/Poly provides also both the standard type and the guided type, just like AEGISII/Mono, allowing one of them to be chosen easily for an operation by taking into account the condition of a patient. Also the lead part of screw provides the self-tapping function, allowing an operation to be performed conveniently without any additional tapping device.