Sightmark Laser Bore Sight Arrow / Bolt. 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. Make your Mark. Specifications for Sightmark Laser Bore Sights Arrow/Bolt: Manufacturer: SightMark Caliber: Universal Included Accessories: Battery pack/Carrying case Battery Pack Carrying Case Limited Lifetime Warranty Fabric/Material: Brass Battery Type: AG5 AG3 Finish: Brass Color: Brass Gun Model: Universal Beam Color: Red Additional Features: Precision accuracyReliable and durableFastest gun zeroing and sighting systemreduce wasted cartridges and shellsCompact and lightweightEasy to pack and travel Condition: New Battery Quantity: 3 Archery Application: Hunting Gun Type: Crossbow Bow Package Contents: Sightmark Laser Bore Sight Arrow/Bolt Provides a convenient accurate method for sighting in bows and crossbows. The boresight screws on the tip of an arrow to show exactly where the bow is aiming with its bright LED red laser. Can be used from 15 100 yards. Includes a battery pack and carrying case.