These probes feature a shrouded 4 mm socket allowing connection to a measurement instrument using a 4 mm "banana" plug test lead. The sprung hook opens up to 10 mm to hold items such as components, IC legs or small conductors.

TA089 Sprung hook probe specifications
Length	121 mm
Height	23 mm
Hook limit	10 mm
IEC 1010 rating	1000 V CAT III 20 A
Color	Black