CanAm Standard Outside Corner Bead RollerBead Rollers are designed for simplicity of use, and make embedding corner bead a breeze. The lightweight frame, and wheels give you superb control, pressing corner bead exactly where it needs to go. Each roller head fits both CanAm's fixed length and extendable handles. Used on square outside corner bead with wheels designed to best fit 3 4 bead. Features: Helps produce precise alignment Prevents wrinkling and blistering Provides excellent adhesion