AKTSC21B is a square tactile switch cap designed for use with 12 x 12mm tactile switches. The cap is available in blue color and features brass construction with silver plating or thermoplastic ABS material. Key dimensions include 10.00mm (0.394 in) width, 12.00mm (0.472 in) overall size, and 3.80mm (0.150 in) mounting dimensions. This cap provides a positive tactile feedback enhancement and is suitable for high-density mounting applications where visual identification and reliable switch actuation are required.