This is the set screw type bronze equalizer to use on balance conscious setups. It makes it possible to have the scope balanced for heavy eyepieces, and when used, allows the same balance setting with light 1.25" EP's. I sold the scope I used it on to help finance a 5" refractor, and no longer need it. Yours for $40 shipped in the lower 48. Postal Money Order or check is OK. MO ships next day, check has to clear.