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Old 01-13-2013, 06:41 PM   #5
ttpete
Rectum Non Bustibus
 
Joined: May 2009
Location: Dearborn, MI
Oddometer: 5,680
12 point and spline drive heads are used on many ultra high tensile strength fasteners because they are stronger and more secure when torquing to the high values they require.
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