COYOTE 9.5″ x 28″ Dome Closure for Buffer Tube – Includes (2) 1-Hole Grommets 0.60″ – 0.85″ (15.2 – 21.6 mm) and (2) 1-Hole Grommets 0.85″ – 1.00″ (21.6 – 25.4 mm).