This Sightmark Laser Bore Sight provides the most convenient and accurate method for sighting in bows and crossbows. Simply screw on the boresight to the tip of an arrow or bolt and a laser dot will show exactly where the bow or crossbow is aiming. Shooters can sight in any optic at 30 yards and switch out the boresight for an arrow or bolt tip to begin hunting. The Sightmark Arrow/Bolt Laser Boresight is sure to take the frustration out of prolonged sighting, as it is easy to use and will save both time and money on arrows and bolts. Includes a carrying case, three (2) AG5 batteries, and instructions. FeaturesPrecision AccuracyReliable And DurableComes With A Carrying Case