Abstract: Mechanism for selecting and controlling needles of circular knitting machine wherein, at each feed of the knitting machine, there is provided a cam path in which is engageable an outwardly projecting butt on an axially reciprocable needle to reciprocate the needle. An activating swing jack is pivoted to the bottom of the needles and a selector jack is pivoted to the unit and is operatively associated with the activating swing jack. A selector butt and a complementary eraser butt on the selector jack are respectively positively engaged by a selector lever and an eraser lever, the selector lever moving the jacks and hence the needles whereby the needle butts engage in the cam path while the eraser lever move the jacks and hence the needles, whereby the needle butts are disengaged from the cam path, respectively to bring the needle into its operative and inoperative condition. The selector and eraser levers cooperate with the selector and eraser butts of the selector jack over the entire length of the feed.