Toolholders Catalogue Numbering System How Do Catalogue Numbers Work? Each character in our catalogue number signifies a specific trait of that product. Use the following key columns and corresponding images to easily identify which attributes apply. DCLNR2525M12KC04 D C L N R Insert Insert Shape Tool Style or Insert Hand of Tool Additional Holding Method Lead Angle Clearance Angle Information D A A L N R= C= 15°BB P , B Right hand Deep pocket forceramic insert L= S= , C C Q C Left hand Single pocketlocating wall C N= F= D D R P Neutral Straight shank,no offset E E S D R H F U E S , K G V F L L Y M P O N P R S T V W C6 widia.com