MICRO MECHANICS Cylinder Hone / Engine Hone Head Glaze Buster Along With 4x SET OF STONES  CAN BE USE BY HAND DRILL EASY OPERATION HEAVY DUTY Dual Carrier Set to Cover Most of The Small Cylinder Blocks As Shown in The Image  SIZE RANGE  2-1/2" TO 5-1/2" / 89 MM TO 137 MM STONE SIZE 1/2" x 1/2" x 4" / 12.5 MM X12.5 MM X 100 MM 4 SETS OF HONING STONES  EXTRA FINE , FINE + MEDIUM + COARSE FEEL FREE TO ASK ANY QUESTIONS ? OTHER SIZES AVAILABLE ! HAPPY TO COMBINE SHIPPING.