Choose and display different keycaps: swap keycaps to your keyboard or arrange them as small desktop decorations that reflect your style. Built for compatibility testing: accepts a shafts tester and fits mechanical keyboard shafts with three or fiveleg configurations, so you can quickly verify fit and feel before committing to a full keycap set. Dual function — test and play: use it as a practical testing tool to check switch compatibility and actuation, or as a small tactile toy to press for brief stress relief and focus breaks. Compact and portable: small, lightweight design makes it easy to keep on your desk, carry to meetups, or use at a retail counter for onthespot demonstrations. Clear value for keyboard enthusiasts and technicians: reduces guesswork when buying or swapping keycaps, speeds up setup and troubleshooting, and doubles as an attractive desk item. Use scenarios: 1) Athome — test keycap fit on various mechanical keyboard shafts (three or fiveleg) before installing a full set, ensuring a correct match and saving time. 2) Retail or bench — quickly verify which keycaps work with a customer's keyboard using the shafts tester attachment, avoiding returns or compatibility issues. 3) Office desk aid — keep on your workspace as a compact fidget and decorative accent to relieve brief stress and maintain focus between tasks.