Precision Benchstones Features & Benefits: Jewelers’ Benchstones These stones are excellent for sharpening the fine, precision cutting tools of jewelers, engravers and artisans . Penknife Precision Benchstones Ideal for sharpening cutting tools, laboratory blades, surgical instruments, engravers’ tools, die makers’ tools, and pocket knives to the keenest edge .   Catalog 5 Pc . 10 Pc . Size Spec . Grit Order No . Price Ea . Price Ea . Price Ea .   4 x 2 x 3/8 HB24    HARD ARKANSAS Jeweler’s Stone Ultra Fine NOR87525 $ 61 . 96 $ 58 . 86 $ 55 . 76 Jewelers Benchstones   Catalog 5 Pc . 10 Pc . Size Spec . Grit Order No . Price Ea . Price Ea . Price Ea .   3 x 1 x 1/4 - 3/8HB13    HARD ARKANSAS Penknife Piece Ultra Fine NOR87550 $ 22 . 50 $ 21 . 37 $ 20 . 25 4 x 1 x 1/4 - 3/8HB14    HARD ARKANSAS Penknife Piece Ultra Fine NOR87555 27 . 01 25 . 66 24 . 31 Penknife Precision Benchstones Waterstones – Produce superior edge for planes and straight chisels Features: Benefits: • System of four “Japanese - type” stones designed to   • Fast sharpening, fine finish   work together • Use with water • Softer than traditional oilstones – providing lapping action • Superb results with low pressure   Catalog 5 Pc . 10 Pc . Size Spec . Grit Order No . Price Ea . Price Ea . Price Ea .   8 x 3 x 1 Combination Waterstone 220/1000 NOR24335 $ 42 . 15 $ 40 . 04 $ 37 . 94 8 x 3 x 1 Combination Waterstone 4000/8000 NOR24336 92 . 35 87 . 73 83 . 11 Waterstones Benchstone Troubleshooting Guide Problem Possible Cause Correction Clogging, glazing or loading Insufficient lubrication to suspend residue Saturate the stone surface with Norton oil of the stone surface Excessive metal removal from Stone is too coarse Use a finer grit tool edge Stone is too soft Use a different type (abrasive) Tool edge breaks down quickly Poor quality steel Use higher quality tool Edge too thin Correct edge angle to duplicate original edge angle   (knives = 15° to 20°) Tool edge not sharp enough Stone is too coarse Hone with finer grit or choose an India or   Arkansas abrasive Tool doesn’t cut properly Check for correct bevel angle Change bevel angle to duplicate original edge angle Check for wire edge Remove wire edge by running across a piece of hardwood   once or twice Straight edge tools Edge out of true (rounded corners) Vertically pass tool over benchstone to square corners 45