Replacement Oregon Chainsaw Chain for Black & Decker LCS1240 40-volt Cordless Chainsaw, 12-Inch Narrow .043" gauge helps reduce the weight of the bar-chain combination approximately 15% LubriLink tie straps help keep oil where it's needed  on the chain. LubriWell oil holes help carry oil around the full length of the guide bar's groove. Chamfer Chisel cutters' twin cutting corners offer outstanding performance, durability and easy maintenance. Witness Mark Top-plate witness mark makes accurate sharpening easier.