High quality, durable and practical brass collar, brass chuck for Dremel rotary tools. Shank diameter: 4.3mm. Diameter: 3 ,2mm, 3.0mm, 2.4mm, 2.0mm, 1.8mm, 1.5mm, 1.2mm, 1.0mm, 0.8mm, 0.5mm.< /p> Suitable for installation with an inner diameter of less than 4.3 mm, for electric grinding, or installation of a high pipe. Compatible with most rotary tools.