M1 Micro-Adjust Buckle
Fitwell M1 Bead Blasted Stainless Steel Buckle
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Firm on purpose: it holds because changing it takes intent. Once you get used to it, you can adjust it on the wrist.
See the two-minute install ›Add precise, half-hole micro-adjustment to your favorite watch straps. The Fitwell M1 Bead Blasted Stainless Steel replaces your existing pin buckle and doubles the number of usable fit positions - giving you a smooth 3mm “half-hole” adjustment.
If you’ve ever found your watch slightly too tight in warm weather or too loose in the cold, the M1 solves it instantly. No tools. No strap modification. Just a precision 316L stainless steel buckle engineered for daily comfort.
Features
- Compatible with most leather, rubber, or fabric straps
- Installs in place of your existing pin buckle - no modification needed
- Smooth 3mm adjustment, right between standard holes
- 316L Stainless steel buckle and tang with stainless-steel spring bar
- Includes one installed spring bar + one spare
Choosing Your Size
Your Fitwell M1 size is based on the width of your strap at the buckle - not the lug width of your watch.
If your strap is straight (non-tapered):
Select the M1 size that matches your lug width.
If your strap tapers toward the buckle:
Measure the width of your strap at the buckle end, or the inside width of your current buckle, using a ruler, tape measure, or caliper.
Choose the M1 size that matches that measurement.
Most tapered straps narrow by 2–4 mm.
Examples:
- A 20mm strap (at the lugs) tapering to 16mm → choose a 16mm M1
- A 22mm strap (at the lugs) tapering to 18mm → choose an 18mm M1
What Size Fitwell Should I Buy?
Step 1: Calibrate your screen
Hold a standard credit card to your screen in portrait (vertical) orientation. Adjust the slider until the card image matches your card exactly, edge to edge.
Step 2: Select your strap width
Each buckle is drawn to scale. Hold the end of your strap against the inner opening to find your exact size.
The inner gap of each buckle equals its labeled width, measured on your calibrated screen.
Your size:
Choose a product type below to see all options in your size.
Installation
Two minutes and a spring bar tool
Watch the install before you buy. The buckle or Link goes on with a spring bar tool, and nothing about your strap changes.
Replacing a buckle with the M1
M1 buckle replacement. About two minutes with a spring bar tool. Written steps