This five-piece set comprises 3.0mm, 5.0mm, 6.0mm, 8.0mm and 10.0mm collets.
ER collets have the unique ability to grip over a diameter range of 1mm without any loss of accuracy. This flexibility makes 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" shank tool (metric 6.35mm), for example, will fit into the 7.0mm collet, which can close down as far as 6.0mm. The collet size stated, represents the maximum diameter, subtract 1.0mm for the minimum capacity.