20MM watch band:
For: Samsung Galaxy watch 7 40mm 44mm
For: Samsung Galaxy watch 6-6 Classic
For：Samsung Galaxy watch 5/5 pro
For：Samsung Galaxy 4 44mm 40mm
For：Samsung Galaxy 6 44mm 40mm
For：Samsung Galaxy watch 4 classic 42mm 46mm
For：Samsung Galaxy watch 6 classic
For：Amazfit GTS-2-2e-mini-GTS 3
For: Amazfit GTS 4
for : Amazfit Bip/U/S/lite
for ：amazfit gtr 42mm
for ：Samsung Galaxy Watch 42mm
for： samsung galaxy watch 3 41mm
for ：Samsung Galaxy Watch Active 2（40mm 44mm）
For ：Huawei watch Gt 2-2e-pro 42mm
For Garmin Vivoactive 3 / 3 music / Forerunner 245 / Forerunner 645
And other traditional or Smart Watches with standard"20mm"lug width.
22MM watch band:
for Samsung Galaxy Watch 46mm
for Samsung Gear S3 Frontier/Classic
for huawei watch gt 2-2e-3-3 pro 46mm strap
For samsung galaxy watch 3 45mm
for amazfit gtr 47mm/Gtr 3/Gtr 3 pro
For Amazfit GTR 2-2e
For Amazfit GTR 4
for Amazfit Bip 6
For Huawei Honor Watch Magic
For Xiaomi Huami Amazfit Pace
For Xiaomi Huami Amazfit Stratos 2/2s/3
For xiaomi mi watch strap
For Garmin Vivoactive 4
