| Image | Summary | ||||
|---|---|---|---|---|---|
 | Clog (twistlock D) (diagonal knurling - 2500) | asymmetric D | full-auto | twist | early twistlock, possibly even the first twistlock model |
 | Clog (twistlock D) (straight knurling 120 deg throw) | asymmetric D | full-auto | twist | early twistlock from originator of the twistlock |
 | Clog (twistlock D) (straight knurling 90 deg throw) | asymmetric D | full-auto | twist | early twistlock from originator of the twistlock |