The Junior chuck is supplied with 7-6mm, 11-10mm and 13-12mm collets; additional collets are also available. Please note: these collets will also fit the Axminster deluxe pen mandrel and the Axminster router collet extension.

These ER20 collets have the unique ability to grip over a diameter range of 1mm without any loss of accuracy. This flexibility means that fewer collets need to be stocked, making them a more economical proposition when compared to other collet-based systems. An additional benefit is that there is no requirement for a separate imperial listing; a 1/4" end mill, for example, will fit into the 7.00mm to 6.00mm collet. Collet nuts are available separately, ideal for customers wishing to make their own holding devices or spindles.