The 4200 can be used with all CURRENT attachments, however, there are some things to consider... If you have what appears to be CURRENT attachments in your possession, with the advent of the 4200 we adjusted some things on those attachments to allow them to fit on the 4200. If the attachment you want to use came in the kit with your 4200, it will certainly work. If you had the attachment prior to owning the 4200 and it doesn't seem like a good fit, do not force that attachment onto the tool. It may simply require a different insert to get it to work and we can help you with that. Another consideration is that the attachment method may not be identical to attaching things to our other high speed rotary tools, so carefully consider all of the instructions for connecting any attachment. For example, to connect the 225 Flex Shaft, the 575 Right Angle, and 670 Mini Saw, you should first remove the housing cap from the tool, then insert the drive coupling (looks like a larger accessory with a square hole in the end), then thread the adapter (solid black cone shaped piece with grip on one edge and threading on the other) onto the end of the 4200. With those things in place, you can now attach the 225, 575, or 670.