"oregon Double Guard® Bar Narrow Kerf Pinion Sprocket, Length 10" "thickness 1.1 Mm Pitch 3/8" "- Bar Attachment A218 - Teeth Number 7 - For Series 90 Micro-lite Chains, The Bar For Lumberjacks Using Electric Saws Or Small-displacement Power Saws With Series 90 Low-profile ™ 90 Series Micro-lite ™ Chains Or 25-inch (p) -shaped Chains With Quarter-inch Pitch. • The Thin, 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, They Are Available In Some Models: Recommended Dimensions Electric Chainsaw Or Gas Up To 2.6 Cu. In (45 Cc) "