Dewalt DW788 Heavy-Duty 20" Variable-Speed Scroll Saw. Double parallel-link arm design dramatically reduces vibration and noise, for extremely accurate cuts. Exclusive tool-free blade holders allow blade changes in seconds. On-off switch, electronic variable speed, flexible dust blower and blade-tensioning lever are all located on the front upper arm for added convenience. Arm design moves the tool's pivot points from the back of the saw to the front, shortening the arm movement for smoother, quieter operation. Arm lifts so blade can be easily threaded through the material for inside cuts. Unique arm design keeps the blade perpendicular to the work, dramatically reducing over or under cutting. Oversized, cast-iron table provides excellent material support and bevels 45 degrees left and right.