SS355-10 Rotozip 5.5 Amp RotoSaw Spiral Saw System SS355-10 Rotozip 5.5 Amp RotoSaw Spiral Saw System features the latest technology to create the most versatile spiral cutting tool and its compact, lightweight construction and ergonomic body are designed to tackle plunge/freehand cuts/cut outs and much more in nearly all building material. SS355-20 Rotozip 5.5 Amp RotoSaw Spiral Saw System features a powerful 5.5 AMP 30,000 MagnaCore motor and dual grip zones to provide maximum comfort and control.SS355-10 Rotozip 5.5 Amp RotoSaw Spiral Saw System has a bump switch to quickly power on/off with one hand and a dust ventoring exhaust vent provides superior dust/debris dissipation. SS355-10 Rotozip 5.5 Amp RotoSaw Spiral Saw System is compatible with all XBits and ZipBits as well as Circle Cutter Guide and Dust Management, sold separately.