20mm Band Width:

 

for Samsung Galaxy Watch 42 mm

for Samsung Galaxy Watch Active / Active 2

for Samsung Gear S2 Classic

for Samsung Gear Sport

for Moto 360 2nd Gen Men's 42 mm

for Fossil Q Gazer

for Huawei Watch 2 / watch 2 pro

for Pebble Time Round Large

for Withings Steel HR 40 mm

for Huami Amazfit BIP

for Ticwatch 2 / Ticwatch E

for Garmin Vivoactive 3 / vivoactive 3 music

For samsung galaxy watch 3 41mm R850

And other traditional or Smart Watches with standard"20mm"lug width.