Smaller Than Standard Hex Head is Ideal for Tight Spaces. Integral hex flange head design with under head serrations distribute uniform clamping pressures. Zinc plated grade-5.
SB-Chevy, 90° V6, and Olds V8: Includes 14 of 1/4''-20 x 1/2'' and 4 of 5/16''-18 x 3/4''
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