Brand: Beta Tools
The 710 Series 3/8" drive impact sockets and accessories from Beta Tools feature cross-drilled holes at the drive ends to accept a locking pin to keep the sockets and extensions from rattling apart. A groove at the base lets you add an O-ring to hold the pin in place. Just assemble the socket stack, insert the pin, then stretch the O-ring over the socket and into the groove.
This large O-ring is designed specifically for the 22mm base OD on 710 Series sockets with 13mm through 21mm hexes, as well as all 710 Series drive accessories (710/16 adapter, 710/20 and 710/21 extensions, and 710/25 universal joint). Sold individually. The matching Beta Tools 710/SP2 Locking Pin is sold separately.