The DEWALT DCS391 Premium Circular Saw with an intelligent trigger allowing total control over all applications. It has a powerful and highly efficient PM58 fan cooled motor with replaceable brushes, which delivers up to 3,700 rotations per minute for a fast cutting action. It has a spindle lock for quick and easy blade change. It has an extremely durable tool design, including a cast magnesium base, which allows repetitive, accurate cuts. With an ergonomic handle set with rubber overmold, the saw provides optimum comfort to the user. Is an efficient cordless solution in trimming wood panels and chipboards. DCS391M2: 2 x 18V 4.0Ah XR Li-ion Slide On Battery Packs.DCS391N: Bare Unit, No Battery or Charger Supplied. A 165mm Carbide Blade, Hex Key and Dust Port are supplied as standard. Specifications: No Load Speed: 5,150/min.Max. Cutting Depth: @90: 55mm, @45: 42.1mm.Blade: 165 x 20mm Bore.Weight: 3.8kg.