This series of pushbutton switches are used for automation and signals in control circuits below AC 660V, DC 440V with frequencies of 50Hz or 60Hz Model No.: XB2-(BC42,EC42) 1) Diameter of installation bore: 22mm 2) Diameter available for mushroomhead: 40mm,60mm 3) Color available:black,green,yellow,red Inner packing: Outer packing 15pcs/box Carton dimensions: 43 x 30.5 x 25cm Model No.: XB2-(BT42,ET42) 1) push and pull type pushbutton switch 2) only color: red 3) other basic feature is same as above stated Model No.: XB2-(BS542,ES542) 1). Mushroomhead with arrow mark carved on it 2) Only color: Red 3) Other basic feature is same as above stated Model No.: XB2-(BS142,ES142) 1).Mushroomhead with key 2) only color: red 3) other basic feature is same as above stated