1/2 Inch Drive x 7/8 Inch Shallow 12-Point Impact Socket Tekton They have a slight wedge

They have a slight wedge shape that grips both sides of the slot

Part Number: assortment-kit-552904 Pieces - Coarse Thread

High Temp Automotive Work

Part Number: DUR124-95-21-IND

1/2 Inch Drive x 7/8 Inch Shallow 12-Point Impact Socket Tekton They have a slight wedgeTwo Size Markings The size is marked in two ways on every socketboth as a high visibility laser marking and a permanent stamped marking Full Length Socket Well While the overall socket is a shallow length, the interior well extends fully into the socket, which allows for better fastener engagement in more situations Works with Friction Ring or Detent Pin Anvils Smooth walls inside the drive end and a detent pin hole make the sockets compatible with