If you're going to use different size slot cutters all the time, invest in this slot cutter set. The set includes the four most common thicknesses - 3.2mm, 4.0mm, 4.8mm and 6.4mm cutters. You can stack one or more cutters on top of each other to vary the cutting height from 3.2mm to 18.4mm. With the included bearing, the slot cutters will cut up 12.7mm deep. Only available in 1/2in shank.