Milling Set for Making Sheet Piles. The set includes 3 bits, a 45 degree end mill and a pair of matching tongue and groove bits. The bits are supplied in individual plastic cases. They are designed for use on a corner table. I think these bits are great for making tongue and groove joints. The beats are well chosen. The blades are sharp and the separate storage drawers prevent the blades from hitting each other when stored. In general, this is a simple solution for making tongue and groove joints.