Just close the lever to secure boards up to 2-3/4'' thick—clamps auto-adjust to accommodate varying thicknesses. Clamping pressure remains consistent regardless of thickness, and is adjustable when necessary with the set screw. Clamp pivots 360° for flexibility of positioning. Knurled wheel locks the clamp into the track. Foot may be adjusted in and out, pivots on a ball joint and is rubber coated to prevent marring. Each clamp includes both long and short T-bolts for use with or without spoilboards.