Retention Bracket & Base for AMD Socket: AM2?AM2+?AM3?AM3+. For chipset: C51?N61?N78?A760?A770?A780?A785?A880?A960?A970?A990 and part number A55/A75/A85. Environmentally friendly, non-toxic material, well-made, strong and durable. Special architectural design, to conduct the weight to the back and stand. Easy and convenient to install.