The 334D two star double ended probe with curved points is made of hardened stainless steel and has an overall length of 5.5.Specs amp; FeaturesDouble EndedQuality: , Surface Resistivity : Conductive, Shape: CurvedCurved, Tip Angle: 45, Material: SS, OAL: 5.5 (137.5mm), Tip Width: .01 (.25mm)