FeaturesDrawn steel housing with steel yoke90 deg vertical aiming capability and 358 deg rotationMedium base porcelain socket with nickel plated copper screw shellCopper alloy contacts provide precise spring actionTrue, positive electrical groundPatented embossed polarity arrows on bottom of adapterSpring loaded locking latch with embossed polarity arrows secures trac light to tracCompatible with both Trac-Lites and Trac-Master tracPull-up contact to up position for use on Trac-Master® two-circuit trac