Fitwell M4 Universal Micro-Adjust Link Stainless Steel Brushed + Polished Your Fitwell M1 size is

Your Fitwell M1 size is based on the width of your strap at the buckle - not the lug width of your watch

Wider tang for straps with wider holes

For non-tapered (straight) watch straps

Most tapered straps narrow by 2–4 mm

Add precise

Fitwell M4 Universal Micro-Adjust Link Stainless Steel Brushed + Polished Your Fitwell M1 size isAdd seamless micro adjustment to your existing deployant or buckle. The Fitwell Micro Adjust Universal Link gives you the same precise fit as the Fitwell M1 buckles, in a compact inline form that installs easily between your strap and existing closure. If your perfect fit falls between two holes one too tight, the next too loose this is your fix. The M4 adds precise sizing without tools or strap modification. Features Works with both deployant clasps