Thickened 6061 AluminumAlloy Plate The thread checker is made of heavy-duty 6061 aluminum alloy, thick enough to last a lifetime.
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Hardness 304 Stainless Steel Thread Nut and bolt thread checkers are made of durable SUS304 material with a hard anodized surface for durability and wear resistance.
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Laser Etched Markings Siloon thread gauge features a laser-engraved scale that allows you to directly measure the size of screws and nuts.
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