The DCS520ST1 includes: DCS520 heavy-duty 60V TrackSaw, 6-1/2 in. (20 mm arbor size) 48-tooth ultra-fine finishing blade wrench, 59 in. track and kit box. The DCS520ST1 features: zero clearance tracksaw cutting system, which delivers precise, straight, splinter-free cuts. TrackSaw dual-edged tracks deliver perfectly straight cuts in both directions and powers through hard woods up to 2-1/8 in. thick. A continuous anti-kickback mechanism and riving knife prevent kickback when engaged. A low profile blade guard allows saw to be used in confined spaces. Straight Plunge Mechanism for optimal ergonomics.