The probe fits for standard 2mm plug it works with most in the field diagnostic devices and automotive testing and repair. Makes it easier to check circuits and piercing the insulation of wires, very handy tools for back probing of automotive electrical measurements. Length: approx 8.5cm/3.35in, Connector diameter: approx 2mm/0.1in, pin stainless steel. probes manipulate in the more sensitive and more accurate, good and ultra-durable. Can be widely used about the non-destructive cable in auto, for , .