Gear Wrench 3/4" Drive 8" Extension 81412 Offered for sale is a Gear Wrench 3/4" Drive 8" Extension. The model number is 81412. Product Features: Ball detent for secure socket retention Knurled grip provides a nonslip surface Hard stamped size markings Bright, full polish chrome finish easily wipes clean and resists corrosion 8" length extension for better access to hard-to-reach fasteners.