Mill-Max Mfg. 511-91-224-18-095002 Contact Material: BERYLLIUM COPPER Housing Material: PCT-POLYESTER Device Socket Type: IC SOCKET Number of Contacts: 224 Device Type Used On: PGA224 Manufacturer Series: 511 Contact Finish - Mating: GOLD (10) OVER NICKEL (100) Contact Finish - Termination: TIN LEAD (200)