Check the listing for details. EXTSW 1/2” ID x 1” OD x 1/2” Thick 316 Stainless Spacer. Condition: New. Listed at 8.90 USD. EXTSW 1/2” ID x 1” OD x 1/2” Thick 316 Alloy Stainless Spacer Actual size .507" ID x .990" OD x .500" Thick (+/-.003" all dimensions) .030 inch Radius OD / Countersunk ID (no sharp edges) It is a beautiful fit for your 1/2” Stainless bolts We can make as many as you need, just contact me. 316 Grade Alloy Stainless contain a higher percentage of nickel than 304SS. The resultant composition gives a much improved corrosion resistance in many aggressive environments. The molybdenum addition ensures more resistance to pitting and crevice corrosion in chloride-containing media, sea water and chemical environments such as sulfuric acid compounds, phosphoric and acetic acids. The lower rate of general corrosion in mildly corrosive environments gives 316 SS a good atmospheric corrosion resistance in polluted marine atmospheres. 316 SS offers good strength and creep resistance and also possesses excellent mechanical and corrosion-resistant properties at sub-zero temperatures.