This SkyJack contact block, part number 147053, is a normally closed (NC) red tip contactor. For emergency stop switch. Fits SkyJack SJIII series scissor lift models including I3215, 3219, 3220, 3226, 4620, 4626, 4632 and rough terrain scissor lifts SJ7127 RT, SJ7135 RT, SJ8831 RT, SJ8841 RT, SJ 9250 RT.