Apex Gear Bone Collector DDP 4 light 19/10 DB Blk Archery Sights. Bone Collector family of archery sights feature a dual-end fiber design that allows for increased pin brightness and compact size. Extra-long fibers are fully protected by durable stainless steel tube pins. Ultra-fine click adjustment for windage and elevation. Aperture with 2" inner diameter gives a large circular field of view and has a glow-in-the-dark shooter's ring. Vertical adjustments are easier with a reversible bracket and level with two vertical bars. Laser markings for windage, elevation and pin adjustments. Ambidextrous design for left & right handed users.