"oregon Double Guard® Bar Narrow Kerf Pinion Sprocket, Length 12" "thickness 1,1 Mm Pitch 3/8" "- Bar Attachment A041 - Teeth Number 7 For Series 90 Micro-lite Chains, The Bar For Woodcutters Using Electric Saws Or Small Displacement Saws With Series 90 Low Profile ™ Micro-lite ™ Chains, 91 Series Or 25a (p) Chains With A 1/4 "wheelbase. • The Thin And Symmetrical Shape Is Light , Manageable And Reversible For A Long Life • The Narrow Spoke Tip Helps To Reduce The Kickback • The Models Are Available With An Intenz® Tensioning Mechanism Integrated Into The Bar Itself • The Holes On The Bar For Mounting The Powersharp® Sharpener On The Bar Itself, Are Available In Some Models: Recommended Dimensions Electric Chainsaw Or Gas Up To 2.6 Cu. In (45 Cc) "