Specifications: Spring: music wire, gold plated P160-E2 needle diameter: 1.3 mm; Needle tube diameter: 1.36 mm; Needle rod diameter: 0.66 mm; Needle total length: approx. 24.5 mm Pin sets sold separately, the needle sheath diameter of 1.32mm Drill size: approx. 1.7 mm Minimum test distance: approx. 1.91mm Full Stroke: 2.50mm Current rating: 3A Current resistance: 50mΩ Plunger: heat treated beryllium copper