3/8 Inch Drive Adapter/Reducer Set (2-Piece) BoltsandNuts.com They have a slight wedge

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

Part Number: BIT-DWDRSD9/32

Part Number: 75X100DPAPL

The reach of extra-long bits allow you access deep into especially narrow

Automotive Repair

3/8 Inch Drive Adapter/Reducer Set (2-Piece) BoltsandNuts.com They have a slight wedgeConnect drive tools to sockets and accessories to expand your range of available tools Polished, chrome plated finish easily wipes clean and is highly resistant to corrosion Beveled drive ends help guide adapter or reducer smoothly onto drive tool Four detent grooves provide a secure connection with the drive tool Spring loaded retaining balls latch into sockets and hold them securely in place Radiused corners inside drive avoid stress concentrations