Tactical Crossbow / bow Bore Sighter. Attaches to any standard arrow with the thread provided and shoots a powerful red laser beam at the target, which allows you to dial in normal or telescopic sights or any archery sight at whatever distance the target is. The easiest way of using this is to attach to an arrow a little forward of the normal position on the crossbow or bow so the sighter hangs over the end of the bow as the laser shoots out of the exact centre of the bolt or arrow which makes this method superbly accurate. Sighter is adjustable for left/right up/down if required and comes new and sealed. UK seller for fast dispatch and delivery.