Engine/Hand tool/610351-610370 SOCKET WRENCH 12-POINT, 25.4MM/SQ DRIVE

These socket wrenches are made of a special chromed alloy steel.  The socket walls are made thin to make it easier to fit to bolts or nuts that are set in narrow, difficult to reach spots.  The nominal sizes of the sockets are determined by the socket opening, not the bolt size.  When ordering, please indicate the size of the square drive opening at the back of the socket:  6.35 mm (1/4"), 9.5 mm (3/8"), 12.7 mm (1/2"), 19.0 mm (3/4"), 25.4 mm (1").  Also specify the number of points in the socket and the size of the opening.  The following illustrations show how to measure the opening of the socket sizes properly.  Careful When Ordering!  American and Metric wrench sizes are taken across the flats of the bolt head, British Standard size is taken from the outside diameter of threads.

这些套筒扳手是由特殊的镀铬合金钢制成的。插座壁做得很薄，以便更容易安装到安装在狭窄、难以触及的位置的螺栓或螺母上。插座的公称尺寸由插座开口决定，而不是由螺栓尺寸决定。订购时，请注明插座背面方形驱动器开口的尺寸：6.35 mm(1/4“)、9.5 mm(3/8”)、12.7 mm(1/2“)、19.0 mm(3/4”)、25.4 mm(1“)。还要指定插座中的点数和开口的大小。下面的插图显示了如何正确测量插座大小的开口。点餐时要小心！美国和米制扳手的尺寸取自螺栓头的平面，英国标准尺寸取自螺纹的外径。