Features:Spring test probes are necessary parts for PCB testing to access components on printed circuit assemblies.There are total 100Pcs spring test probes in one set that you can use for a long time.Cone shape head can be used for testing through-hole components.Widely used for testing PCB gold fingers(edge connectors) and pads. They are great replacement probes if you need to change broken or old test probes. Specification:P75-E2:head Shape: ConeCurrent Rating: 3AResistance: 50mStroke: 6.5mmhead Diameter: 1.5mmProbe Tube Diameter: 1.36mmProbe Rod Diameter: 0.99mmProbe Length: 33.3mmBoring Size: 1.7mmMin. Test Interval: 2.54mmQuantity: 100pcsP50-J1:head Shape: RoundCurrent Rating: 3AResistance: 50mStroke: 2.6mmProbe Tube Diameter: 0.68mmProbe Rod Diameter: 0.48mmProbe Length: 16mmBoring Size: 0.9mmMin. Test Interval: 1.27mmQuantity: 100pcs P100-E2:head Shape: ConeCurrent Rating: 3AResistance: 50mStroke: 6.5mmhead Diameter: 1.5mmProbe Tube Diameter: 1.36mmProbe Rod Diameter: 0.99mmProbe Length: 33.3mmBoring Size: 1.7mmMin. Test Interval: 2.54mmQuantity: 100pcs P50-B1:P50-B1 - 16mmPin Centre: 0.68mmMin test distance: 1.27mmSpring Pressure: 75gFull Stroke: 2.65mmCurrent Rating: 3ACurrent Resistance: 50mmPlunger: Heat Treated Beryllium CopperBarrel: Phosphor Bronze . Gold PlatedSpring: stainless steelP75-B1:Specification:spring thimbleNeedle tube diameter: 1.02mmNeedle bar diameter:0.74mmPin Total Length: 15.8mmDrill size: 1.4mm;Minimum distance between test: 1.91mmPackage Included:100 x Probes.