12x12x7.3 mm Round Cap for Square tactile Switch ? Red (Pack of 5) :
It is a Round Cap for Momentary Tactile Push Button Switch 12 x 12 x 7.3 mm. The cap fits on a 12 x 12 x 7.3 mm tactile push button switch. It fit perfectly on a 3.4 x 3.8 mm button square shaft with locking notch.