This is a red insulated binding post. These binding posts *do* accept banana plugs, and are a great way to connect single-wire leads. The colored cap screw
Binding Post - Red from MindKits New Zealand
Hackers in Residence - Cosmic Ray Detector - SparkFun Learn
Pomona 3760-2 Binding Post, TIN PLT. (RED): : Industrial
Sparkfun
14.4v Rechargable Battery Power Supply ^updated With Banana
PRT-09388 - SparkFun Stock e waatea ana.Ko te kaiwhakawhiwhi Micro
PRT-09835 SparkFun PRT-09835 Stærð laus frá Infinity
Binding Post (4mm Socket) - Red - Proto-PIC
Description Documents This is a red insulated binding post. These binding posts do accept banana plugs, and are a great way to connect single-wire
Binding Post - Red
Digital LED Voltmeter from MindKits New Zealand
7004 Keystone Electronics, Connectors, Interconnects