This Aluminum spacer is 0.438 inches long and has an inside diameter of 0.313 inches.
Aluminum Spacer 3/8 OD x 1/4 ID, Round Spacer, Unthreaded Standoff, Bushing, Plain Finish, Fits Screws Bolts 1/4 or M6 by Metal Spacers Online (1 Length, 2 Pack): : Industrial & Scientific
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Fastenerdata - THREAD CHART 10b - Fastener Specifications
Fasteners & Hardware - Page 1 - SK Speed Racing Equipment
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0.375 in. ID 0.438 in. OD 1.800 in. Long Brass Spacer - AndyMark, Inc
This aluminum spacer is 0.688 inches long and has an outer diameter of 0.313 inches.
0.313 in. ID 0.438 in. OD 0.438 in. Long Aluminum Spacer - AndyMark, Inc
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0.192 in. ID 0.313 in. OD 1.500 in. Long Aluminum Spacer - AndyMark, Inc
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Discountable Brands – Page 772 – MAPerformance