Cec Series conductive caps are designed for all common sizes of threaded electrical and electronic connectors. These caps are also suitable for protecting non-threaded bayonet Type connectors. In addition to dissipating Electrostatic charges, they provide an electrical shield over the end of the connector. Designed to meet specs MS/as 90376, SAE AS85049/138. This product has been fabricated from a conductive material that: surface resistivity of less than 1 x 10 5 ohms/square in accordance with ASTM Test method d-257-78:: C nts: 5/8, a: 0.607, b: 0.84, C: 0.50, D: 0.667.