Vinkor Stainless Steel Adapter for Apple Watch 38mm Band Connector, Apple Watch Clasp, No Screws or Screwdriver Needed and Super Easy to Install and Remove - Fit for any 20mm straps - 38mm Silver;

Installation
Step 1:
Slide your spring bars into the hole on the long and the short end of the strap. Push them all the way in so they are centered inside the strap.

Step 2:
From the back side of the adapter, insert one end of the spring bar into the hole on the adapter lug.

Step 3:
Use your spring bar tool to depress the other end of the spring bar, so it slides inside the adapter lug. Make sure both ends of the spring bar securely snap into their holes, or the strap will fall off the adapter.

Removal:
Step 1:
From the back side of the adapter, insert the pronged (forked) end of your spring bar tool in between the strap and the watch lug. The spring bar has a ridge that the tool will grab, allowing it to compress.

Step 2:
Gently apply pressure inwards towards the strap (away from the adapter) to depress the spring bar. At the same time, apply some downward pressure so the bar will pop out. If you press to hard/fast, the tool may slip and damage your strap.