Urhelper 90221UH 10-Piece Tungsten Carbide Woodworking bit Set For Dremel Tools Includes 10 different shapes: cylindrical, ball, oval, arc, cone and so on for various uages Shank diameter: 1/8"(3mm), works for most die-grinding tools Uesd on metal wood and stone for carving and drilling, can be replaced for gringding wheel with shank Long life time, could be ten times durable than HSS material cutters, Comes in a PVC box for easy storage & organization, mini size