Attractive 3/8 inch diameter anodized Stripe/Embroidered aluminum body Pen size 5-1/2 inch long when closed (9inch open) with pocket clip Handle Material: Diamond sharpening working length: 4-1/2inch Built-in chuck positions & firmly holds sharpening stone Simply loosen chuck nut to remove & replace sharpening stone Stone shape: One flat side, two round side with small grooved surface, plus a larger wide V groove Stain and rust proof Handle (utilized as holder to store diamond stone inside) has Non-Slip Finger Grip surface on body and chuck nut to aid in removing or replacing sharpening stone and for more positive control during tool use. Diamond stone has flat side for sharpening standard knives, round side for sharpening serrated knives, V groove for sharpening fishhooks, darts and arrows or all sides may be used for filing. Simply loosen built-in chuck, slide out diamond stone and tighten chuck nut. All machined parts are plated or made of materials to help prevent rust & corrosion. Suggested Uses: SHARPEN Knives, Scissors, Kitchen Utensils, Fishhooks, Darts, Hunting Arrows, Garden Tools, Router Bits, Shop Tools, Camping Tools, Ice Skates ; UTILITY FILE for model making, shaping metal or wood, Fingernail File, deburring & removing sharp edges from metal, wood, plastic & other materials ; Gifts : Imprint for advertising promotions. Industrial Uses: Filing, deburring and to remove galling or burrs from small holes such as machine collets ; Sharpen utility knives.