ALL 9 EXTENSION BARS HAVE A HEAVY DUTY SPRING LOADED BALL BEARING TO HOLED SOCKET SECURELY IN PLACE. BLUESPOT 9 PIECE MIXED DRIVE EXTENSION BAR SET 1/4" - 3/8" - 1/2" DRIVE. WITH KNURLED NON - SLIP GRIP ON SHAFT FOR EXTRA GRIP ON THE EXTENSION BARS.
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