Fitwell M1 Black Buckle

Add precise, half-hole micro-adjustment to your favorite watch straps. The Fitwell M1 Black 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 black-finished 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 buckle and tang with stainless-steel spring bar
• Includes one installed spring bar + one spare
• Free US Shipping $50+
• Free US Returns

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

Read More