Item Type: Tapping Chuck Optional Model: M3, M4, M5 M3 is Suitable for Tap Size: Shank Diameter x Square Head: 4.0 x 3.2mm M4 is Suitable for Tap Size: Shank Diameter x Square Head: 5.0 x 4.0mm M5 is Suitable for Tap Size: Shank Diameter x Square Head: 5.5 x 4.5mm Package List 1 x Tapping Chuck Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. 1Widely used in tapping machines, drilling machines, milling machines, boring machines, electric tools, pneumatic tools and other equipment with reversible spindles. 2Good clamping strength and accuracy, long service life. 3Quick and safe replacement of tapping chuck, can connect drill chuck post. 4Torsion type tapping chuck can prevent the tap from breaking. 5Made of high-quality materials, high hardness, high strength.