Reachs 1 Pair Full Insulation Red Black Car Battery Test Lead Protecting Alligator Crocodile Clip Clamps with 4mm Socket Offers Good Contact on Fine Wire Ideal for battery terminals or clip connections, allows secure connection to battery positive or negative points as well as earthling points Full insulation protecting crocodile clip with 4mm socket Heavy duty alligator clips, allows secure connection to battery positive or negative points as well as earthling points The toothed grip offers good contact on fine wire, with a 30 mm jaw opening limit The crocodile clips are fully insulated with a 4 mm socket in the handle, offering an easy connection to the test lead