20mm applicable watch model:

For Samsung Galaxy watch4 40MM/44mm

For Samsung Galaxy watch4 classic 42MM/46mm

For Samsung Gear S2 Classic, Gear Sport;  Huawei watch 2

For Gear Sport SM-R600

For Gear S2 Classic SM-R732 & SM-R735 (BUT NOT fit for Gear S2 SM-R720 & SM-R730)

For Samsung Galaxy Watch Active

For Samsung Galaxy Watch 42mm

For Samsung Galaxy watch Active 2 40mm

For Samsung Galaxy watch Active 2 44mm

For Moto 360 2nd Gen Men's 42mm

For Fossil Q Gazer

For Huawei watch 2 sport

For Pebble Time Round Large

For Withings Steel HR 40mm

For Ticwatch 2 / Ticwatch E

For Garmin Vivoactive 3

For Garmin Vivoactive 3 Music

For Garmin Forerunner 645 Music

For Garmin Forerunner 645

For Garmin Forerunner 245

For Garmin Forerunner 245 Music

For Huami Amazfit GTR 42mm

For Huami Amazfit BIP

For huami amazfit BiP pace Lite

For huawei AMAZFIT bip youth

For Huamei amazfit GTS

For Garmin Approach S40

For Garmin Vivomove HR

For Garmin vivoactive 3t

For Samsung Gear S2

For Samsung Gear Sport

For Ticwatch e

For Garmin Vivomove HR

For Garmin Venu

For GarminMove 3

For GarminMove Luxe

For GarminMove Style

22mm applicable watch model:

For HUAWEI WATCH 3 46MM

For HUAWEI WATCH 3 Pro 48MM

For Huawei Watch GT

For Samsung Galaxy watch 3 45mm

For Samsung Galaxy watch 46mm

For Samsung gear S3 front

For Garmin fenix Chronos

For Xiaomi Huami Amazfit Stratos Pace 2

For Xiaomi Huami Amazfit Stratos Pace 2S

For Samsung gear S3 classic

For Xiaomi Huami Amazfit 2/2S

For Ticwatch Pro

For Xiaomi Huami Amazfit GTR 47mm

For huawei Magic GT

For Huawei Honor Watch Magic

For Huawei magic Watch 2 46mm

For Huawei Watch GT2 46mm

For Huawei Watch GT

For Huawei Watch Gt Active

For Huawei Watch Gt Elegant

For Garmin Vivoactive 4