McElroy™ Detent Pin
 
Quick-Release Alignment Pin With A Solid Shank And Spring-Loaded Locking Balls. The Integral Head Provides Exact Grip-Length Tolerance. Locking Balls Hold The Pin In Place By Spring Force (not Positive Locking Like A Ball Lock Pin). Simply Push The Pin To Insert, And Pull To Remove. 
 
Sizes Available:
3/8"
1/4"
3/4"
 
Lengths:
2"
3.75"
3.8"
5"