Double ended nut driver fits 7/16' and 1/2' posts, quality tool with metal inserts.

Directions:
Please be careful not to over-tighten your connections. Too much force can case the (usually) plastic nut, or even the whole post to become loose.

You will have an ideal corrosion-free “gas-tight” connection once the binding post leaves marks on the spade lugs. This deformation of the metal is the sign of a quality connection.

If you have difficulty squeezing the metal spade hard enough to leave marks, you might have brass spades, probably with nickel plating under the gold. Don’t break your amplifier trying to leave marks.

Stereophile Recomended Component

"A great idea improved, similar to the Postman, but with a metal sleeve enforcing the sockets" Stereophile Vol. 2 No.9