Molded-plastic board can permanently mount to tabletop, or be clamped down temporarily. Position at different angles for varying degrees of shoulder extension. 31"H x 8½"W (79 x 22cm), with a 24" (61cm) base. Use bilateral or single handle. Sliding piece is a 2¾" x 5½" x 8½" (7 x 14 x 22cm) box to which weights can be added to increase resistance.