2" rack and pinion reflector focuser (Synta style). Does not come with the 1.25" to 2" adapter. I took it apart and removed all the stock grease (glue) and replaced with white lithium grease. Adjusted the focuser with the tiny allen screws. Pretty smooth operation with very slight tube play. Could probably use a little more adjustment. Pictures available tomorrow. $35.00 shipped within CONUSA only payment via Money Order.