1/4, 3/8, 1/2, 3/4 Inch Drive Adapter/Reducer Set (7-Piece) Channable Exclude The adjustment knob is knurled

The adjustment knob is knurled and round to provide grip for making adjustments even when you're wearing gloves or have slippery hands

Part Number: BIT-DAM6X1/2X3/8

and they're designed to be longer than standard bits to improve your access to recessed fasteners

Part Number: BIT-DWTHX1213

Full Back of Hand Impact Protection

1/4, 3/8, 1/2, 3/4 Inch Drive Adapter/Reducer Set (7-Piece) Channable Exclude The adjustment knob is knurledConnect 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