Goodson Brand HN-202S 150-Grit Honing Stones are designed for short/blind holes. They exert more pressure at the bottom. Each honing stone set has 4 pieces: 2 holders with integral stones (2-1/3/16" L), and 2 holders with aluminum wipers. These stones are slightly softer than our HN-202 and perform much like Sunnen® M27-J45-71.