Armstrong 39-321 Deep Length Socket

Armstrong Socket, Deep Length, Series, Measurement System, Square Drive, Drive Size, in 1/2, Socket Size, mm 21, 3.205 Overall Length, Opening Depth in, in 1-1/2, 1.126 Drive End Width, Socket End Width in, in 1.126, Ball Locking, Number of Points, Bolt Clearance Depth, in 0.772, High Alloy Steel, Finish

• Radius corner design engages the flats of the fastener, not the corners, providing up-to 15 to 20% more torque while reducing fastener rounding, enhancing the turning of worn fasteners
• EYE-D markings optimize size visibility, also providing SAE/metric differentiation
• Unique socket retention method, cold form ball recess, provides consistent secure retention of the socket to the drive tool eliminating the possibility of either a loose fit or tight fit