TruGlo Versa Pees are versatile interchangeable inserts that allow the shooter to customize peep for preferred size and color. Lightweight aluminum construction and percision CNC machined make these peeps superior to others on the market today. Metal peep sight is 1/4 inch in diameter without insert. The angled design for shorter axle to axle bows is perfect. Inserts included are 1/8, 5/32 and 3/16 inch and colors included are black, red and green.