Clock Keys winder size finder Measure measuring gauge tool sizes key sizer MM

Clock key size gauge that identifies key sizes from 000 to 15 in one quick check.

⭐ At a glance

📏 Measures clock winding key sizes from 000 to 15

✅ Works with standard clock winding keys to identify the correct size

✔️ New, unbranded tool

🔧 What it does & how to use

This gauge is designed to help clock repairers and hobbyists quickly find the correct size of a clock winding key without guesswork, avoiding the need for a full set of trial keys. It's a handy bench aid whether you're identifying a key you already have or working out which size key you need to buy or make for a movement.

• Take the key: pick up the clock winding key you want to identify.
• Insert into the gauge: fit the square end of the key into the corresponding hole or slot on the sizer.
• Find the match: work through the marked sizes (000 to 15) until you find the hole the key fits snugly.
• Read off the size: the marking next to the matching hole gives you the key size number.
• Use the result: use this size when ordering, replacing or matching a winding key to a clock movement.