1. Cylinder Engine Hone Kit 2-1/2" to 5-1/2" Honing Machine. This kit includes 16 pieces of Honing Stones. 2. Cylinder Hone / Engine Hone head dual carrier set to cover most of the small cylinder block size range 2-1/2" to 5-1/2". 3. Honing stone sizes: 4" inch X 1/2" inch X 1/2" inch. 4. This set comes with 4 Extra carriers. 5. Details of 16 pieces of stones includes following: Superfine (320)- 4pcs, Fine (220)- 4 Pcs, Medium (180)- 4 Pcs, Coarse (120)- 4 Pcs