Made to Secure Bullet Resistant 1-1/4" (32 mm) Acrylic or Polycarbonate Barrier Systems in High-Security Applications Made of High Quality Stainless Steel to Provide Reliable Security Available in a Variety of Finishes to Provide an Attractive Design to your Installation These CRL Surround Sound Spacers are designed for use with bullet resistant acrylic or polycarbonate. Spacers secure a secondary glazing panel behind a primary glazing panel to provide natural voice communication. Two different styles are available. The PB011, with square end caps, is used if you want to match other CRL Barrier Clamps. The CDS3S, with 1-1/4 inch (32 millimeter) round end caps, is used if you want to add a different look to your application. Color: Brushed Stainless Diameter: 1-1/4 in (32 mm) Minimum Order: 1 Package Three per package.