Add precise, on-wrist micro-adjustment to your favorite watch straps. The Fitwell M1 Yellow Gold replaces your existing pin buckle and doubles the number of usable fit positions - giving you a smooth 3mm “half-hole” adjustment whenever your wrist size changes throughout the day.
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 lightweight titanium 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
Adjusts on the wrist with a smooth 3mm micro-adjustment
Titanium 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
