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  • M1 18mm
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Fitwell Buckles

M1 Micro-Adjust Buckle

Fitwell M1 Yellow Gold Buckle

$40.00 USD
$40.00 USD
Sale Sold out
Shipping calculated at checkout.
Choose your finish
Silver ✓ Silver Black ✓ Black Yellow Gold ✓ Yellow Gold Rose Gold ✓ Rose Gold Bead Blasted ✓ Bead Blasted
Titanium · $50
Silver ✓ Silver Bead Blasted ✓ Bead Blasted
Find my size

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.

Match all four edges of your physical card to this image

•••• •••• •••• 4291 FITWELL

85.6mm

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.

Size
Material
Color
✓ Fast Shipping·✓ Free 30-Day Returns·✓ Secure Checkout·✓ Patented

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 ›

Free US Shipping $50+. Free US Returns/Exchanges.

Add precise, half-hole 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.

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 gold-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

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

View full details

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

Collectors say

4.63 ★ (148)
Verified
  • 5 stars: 4 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
B
Benni Gee
Thank You, Fitwell!

I have a 6.25 inch wrist, and buying a leather strap for my watch has always become an issue. It is either too tight or too loose on my wrist. I'm glad that now I found a solution. This adjustable buckle is a work of a genius! Definitely would buy more!

Benni, thank you for this. That in-between wrist size is exactly the problem we built the M1 to solve, and I'm glad it's working for you. Really appreciate you taking the time to write.
-Tom

N
Nick
Instant Improvement on Every Watch

I'm obsessed with this clasp and am adding to almost every watch with a leather, rubber, or NATO strap.

M
Michel Turcotte
Gold buckle 16mm

Beautiful watch buckle. Surprised by the impeccable quality. Outstanding service and fast USPS delivery. I highly recommend it. My next onr a silver ...

M
Mark Wille
Every watchstrap needs one of these

Brilliant. The ‘half a hole’ adjustment we never had. Tighten or loosen your strap on the fly. I’m going to need a silver version too now..