Description:3.0/3.175mm To 2.35mm Three Petal Spring Grinding Machine Handle Half Ring Electronic Pen Chuck Polishing Engraving Machine Conversion HeadSpecifications:Product NameThree Petal Spring Conversion HeadTypeA:3.175mm to 2.35mmB: 3.0mm to 2.35mmMaterialStainless steelUsesEngraving machine, p..