For bits series 1 - 1/4" - 6.35 mm drive.
The sockets Ref R.235 - J.235 - SJ.235 include a standard clip for frequent removal.
The socket Ref R.245 includes a retaining clip ensuring the bits are held firmly. For rare removal, the drive is fitted with a hole for ball or plunger locking.
1/4" DRIVE STANDARD SPRING-CLIP BIT HOLDER (Facom)