don’t get me wrong I am totally happy with the collet set but unfortunately they are not ER.
reference this chart
http://www.desktopcnc.com/useful/collet_info.htm
Though they are about the length on an ER 40 check your major diameter. An ER40 is 41mm where as the syil set is about 20mm something. Like i said before there is nothing wrong with them just don’t go buy more collets thinking an ER40 will work.
Thanks for posting the pics Legion99999