Axminster ER32 precision collet holders. available in 3MT or R8 with a 12mm draw bar thread.
ER collets have the unique ability to grip over a diameter range of 1mm without any loss of accuracy. This flexibility means that you need fewer collets 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 7mm to 6mm collet.
22 January 2014
ExcellentER collets will hold any parallel round shank tool or workpiece and, since the collets contract over a 1mm range, will hold any metric or imperial size. They will hold any type of cutter with a parallel shank, including threaded end cutters (although an autolocking Clarkson type collet holder, also supplied by Axminster, will give better grip).