Mors Kochanski’s knife use teaching aid. The “Try Stick” has developed an underground following. it is approximately an inch to inch and a half in diameter. One carves various types of carvings that would commonly be used in woodcraft/bushcraft, though some are more to showcase ones ability to wield a knife. There are many beautiful examples floating around the net, from woodcrafters who have demonstrated their ability and prowess with a knife. Note Mark Emery of Kepis Bushcraft.