Ko-ken PK3763/6 3/8 Sq. Dr. Wobble-Fix Extension Bar Set 32-250mm 6-Pc — Sockets & Sets product photo
Ko-ken PK3763/6 3/8 Sq. Dr. Wobble-Fix Extension Bar Set 32-250mm 6-Pc — additional product view
Sockets & Sets

Ko-ken PK3763/6 3/8 Sq. Dr. Wobble-Fix Extension Bar Set 32-250mm 6-Pc

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The Ko-ken PK3763/6 is a 6-piece 3/8-inch square drive wobble-fix extension bar set covering lengths of 32, 50, 75, 125, 150, and 250 mm, supplied in a color-coded ABS storage tray that keeps each bar organized and identifiable by size. Ko-ken's wobble-fix design allows the attached socket to pivot at a fixed angle while still locking securely in the straight position, giving the user both a slight articulated reach for angled or recessed fasteners and a rigid, true extension when working straight on. Machined from alloy steel with precision square drives on both the input and output ends, the bars transfer torque reliably without the free play of a standard universal joint, making the set well suited for tight engine bays, transmissions, machinery, and other confined spaces where a straight extension cannot align. The graduated lengths let technicians build exactly the reach they need for a given fastener without stacking multiple loose extensions, and the durable silver finish resists corrosion in workshop and jobsite environments. Brand: Ko-ken; Manufacturer Part Number: PK3763/6; Drive Size: 3/8 inch square; Included Lengths: 32, 50, 75, 125, 150, 250 mm; Piece Count: 6 extension bars plus 1 ABS tray; Material: Alloy Steel; Finish: Polished Silver; Measurement Standard: Metric and SAE; ASIN: B004IKMIGM.

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Choosing Sockets & Sets

6-point or 12-point sockets — which should I use?

6-point sockets grip the flats of a hex fastener for maximum torque and resist rounding, ideal for stubborn or high-torque fasteners. 12-point sockets offer more engagement positions for tight clearance, but apply force closer to the corners and are more likely to round a worn fastener.

Do I need impact-rated sockets?

Use impact sockets (typically chrome molybdenum, black finish) with impact drivers and wrenches; standard chrome sockets can shatter under impact loads. For hand ratchets, chrome sockets are fine and are thinner-walled for tight spaces. Match the socket drive size to your ratchet.