Bosch 1521 16 Gauge Shear 4.2 Amps with 5000 SPM features Lock-on/off switch for extended use applications, a Compact design with slim tool housing that comfortably fits in the hand, and a Reversible side blades for extended blade life. Also, it offers Bosch Cutting blade changes quickly and without tool for convenience and fast cutting mechanism cuts at 28 feet/minute while Epoxy coated field windings provides ultimate protection against metal debris, plus the tool is Double insulated, UL listed, complies to OSHA and Sealed switch that keeps debris out of the switch mechanism and extends switch life.