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* Class IIIa 635nM Less Than 5mW. Clear and bright red laser. Avoid Direct Eye Exposure to Beam.
* Fit for 9mm /.375 cal / .41 cal / 40sw/10mm.It is Front Insert Arbor Boresighter (without Muzzle Device).
* It is a perfect Tool to sight in you Iron Sight, Red Dot and Scope.
* Easy to sit perfectly in the bore with 4 sets rubber rings.
* Sturdy BRASS construction.
* 2 sets (6 total) of batteries