Abstract: A radiation tube structure is a mental tube formed with lengthwise grooves and circular grooves along an internal wall of the tube to produce capillary symptom to dissipate heat.

Abstract: A ZIF PGA socket (20) includes a base (22) and cover (24) slidably relatively moveable thereto, and a lever (40) sandwiched between the base (22) and the cover (24) wherein the lever (40) includes a handle (42) exposed and accessible in an exterior and a cam shaft (44) embedded within an upper half channel (30) formed in the cover (24) and a lower half channel (32) formed in the base (22). The cam shaft (44) includes a projection (50) integrally radially extending therefrom for engagement with an engagement surface (56) formed within an opening (54) in the base (22) whereby the lever (40) can be substantially stopped in a vertical position for allowing the socket (20) in an open status to load a PGA thereto in a ZIF manner. The handle (42) further includes a rib (60) formed proximate the front end thereof for engagement with a facing downward abutment surface (62) formed on the base (22).