BU-63-0 - 

Insulated Alligator Clip, 10 A Current Rating, 2-1/4 in. Length

Plated steel except BU-60C, BU-60CHS, BU-60CS, BU-63C, BU-70CS and BU-85C which are solid copper. BU-60CHS, BU-60HS and BU-60HPR have insulated acetate handles. BU-63 and BU-63C have 2-piece flexible vinyl insulation; barrel takes wire or banana plug connection. BU-60 and BU-60C have lip for soldering. BU-60S and BU-60CS are the same as BU-60 except have 6-40 screw. BU-70CS and BU-70S have a 6-40 screw. BU-85 and BU-85C are crocodile clips.
Nose width 0.13 in.