MaxxMacro® (D/C) & Maxx-ER ER20 Collet Replacement Locking Nut Rust ProofMaxxMacro 54 ER20 Collet Chuck Locking Nut replacement nut for MaxxMacro Collet Chuck, ensuring secure and accurate operation. This nut works on all MaxxMacro, Maxx ER ER20 Collet chucks. This ER20 Collet Replacement Locking Nut is designed with a rust proof, corrosion resistant chrome finish. Material: 4CR13 SUS
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