Item Informaton 2 Male Type Shock Collar Metal Probes: 0.78 Inch(20Mm) Long With Extra 3Mm Long External Thread, Fit For M3 Internal Thread Hole Deepth No Less Than 3Mm 2 Conductive Silicone Covers: 0.59 Inch(15Mm) Long Install The Silicone Covers On Probes Before Use Package Includes 2Xcontact Points 2Xconductive Silicone
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