Hi everyone, years ago, I invested in these. They are a special design that grip by the sides and not the corners. Multihex ring spanners and sockets use this principal these days. These single hex ones are designed to work on both metric and imperial fasteners which why they have the name Metrinch. Sometimes they can even fit the next size down.
Funny thing is I often just use my old regular sockets and spanners instead of getting these out.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
