I bought 10 of these. Of the 10, five have a good grip on the 1/4 inch socket side and are usable. The other 5 do not have a firm point of contact with the ground (or sleeve) terminal. It is hit-or-miss if what you plug in makes contact or not.
PROS: Good price
CONS: big variability on the connection on the 1/4 inch socket side. You may or may not get a good connection, depending on manufacturing tolerances. Buy 2 to get 1 good one.
I purchased a different brand of these from another on-line company that has the same name as a rain forest and river in Brazil and had to return them since they did not work with a mono 1/4" plug (as stated). These work! Mono 1/4" jack to mono RCA plug as advertised.
I had a similar experience with someone else who bought these and left a review... I bought 10 of these and about half did not have a secure connection on the socket side. There was significant wiggle-room inside the connection. Also, the male end almost felt too big, as I had to push with force into my mixer's female end. I give it three stars because of the price and I really like the variety/availability of items this company carries, but just little disappointed... :(