Specification Brand : NDNCZDHC BulletPoint1 : 4 JAW STRUCTURE: These chucks are of a 4 jaw structure, which provides good contact and strong burr grip, to ensure stable and reliable. BulletPoint2 : HIGH CARBON STEEL: These spring chucks are made of high carbon steel, which has high hardness, impact resistance, and stable performance. BulletPoint3 : MULTIPLE USAGES: These 4 jaw collets are suitable for clamping various grinding head, tool holder, etc., for automotive tires repair and grinding. BulletPoint4 : SPECIFICATIONS: Including 4pcs spring collets, ERG20 series, different sizes to meet different clamping needs, and equipped with boxes for storage. BulletPoint5 : APPLICABLE MACHINE: Widely used in machining center, for ordinary grinder, CNC grinding machine, engraving machine, high speed machine, etc. ExternallyAssignedProductIdentifier : 4680708350018 IncludedComponents : No ItemName : NDNCZDHC 4PCS ERG20 Collets 4 Jaw Spring Clamping Tool Chuck Set for CNC Lathe Engraving Milling Machine ItemPackageDimensions_Height : 3 centimeters ItemPackageDimensions_Length : 10 centimeters ItemPackageDimensions_Width : 8 centimeters ItemTypeKeyword : workholding-collets Manufacturer : NDNCZDHC ModelName : NDNCZDHCmd4vys2ew3 ModelNumber : NDNCZDHCmd4vys2ew3 PartNumber : NDNCZDHCmd4vys2ew3 PowerSourceType : ac/dc ProductDescription : Item Type: Collet Set Material: High Carbon Steel Specification: d=9 x 7.1, d=9 x 7, d=8 x 6.2, d=8.5 x 6.5