"This Phoenix Standard 1/2in. Shoulder Bushing allows you to quickly and easily change the dia. of a 5/8in. bore down to 1/2in. Product Style Shoulder bushing, Part Type Bushings, Material Type Steel, Bore Diameter in. Converts a 5/8 in. bore to 1/2 in. bore, Compatible With Idler pulleys. Easy-to-use shoulder styling"
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