The strap is 18mm at the deployment clasp side.
Fitted 20mm and 22mm lug watches.
The watch and the deployment clasp in the listing pictures are not included
Straps size:
Length: 108mm +84mm (4.25" + 3.25" ) approx. without buckle
Thickness: 2.0mm -6.0 mm approx.
Use a metric ( mm ) to measure your watch lug size