•Versatile interchangeable inserts allow the shooter to customize peep for preferred size/color (patent pending). •Lightweight aluminum construction. •Precision CNC-machined. •Metal peep sight is 1/4" dia. without insert. •Angled design for shorter axle-to-axle bows. •Inserts included are 1/8", 5/32" or 3/16". •Insert colors included are black, red and green.