"bar Oregon Pro-am® Narrow Kerf Pinion Sprocket, 13" Long "thickness 1.3 Mm Pitch .325" "- Bar Attachment K041, The Bar For Lumberjacks Using Small Or Medium Chainsaws With Chains Of .325" Or 3/8 "features • The Slim And Symmetrical Shape Is Light, Manageable And Reversible For Long Life • The Narrow Spoke Tip Helps To Reduce The Kickback • Models Are Available With A Tensioning Mechanism Integrated Into The Bar. (62 Cc) "