One end of test lead is 4.000 in. Lg and 0.375 in. W. And the other end of the test lead is 1.000 in. Lg and 0.375 in. W; test lead ends possess 1/4-32nf-2a threads; one test lead has a awg 20 and carrys amp. Current; the other test lead has a awg 18 and carrys 10 amp. Current