Ratcheting Aluminum 4-1/2" Cup Vertical Backsplash Seam Setter designed for use in stabilizing and supporting backsplashes during installation. Vacuum for the seaming tool is produced by pressing down the lever on the 4-1/2" cup. Constructed from high density aluminum alloy with ABS ball handle knob. Suitable for all materials with plane like glass, plastic, metal, wood, marble, etc. Typically, one setter is required for every two to three feet length of backsplash.