Alvin - PXB Portable Parallel Straightedge Board - 18x24 - AlvinÆs PXB boards provide the convenience of a studio work surface in a compact, portable unit. Each PXB is made from a smooth, warp-free white Melamine« laminated board and is equipped with a convenient carrying handle, non-slip tractor feet designed to grip the table edge at the perfect drawing angle, foldaway legs, and an acrylic straightedge whose height can accommodate material thicknesses up to 3/16"". Shipped fully assembled. Features include: Precision-made aluminum straightedge with rubberized grip eliminates the need for a T-square and includes an inking edge for clean, smudge-free results with pens, pencils and markers. Underwire system keeps the blade parallel no matter where it is moved. Metal side brackets accommodate material thicknesses up to 3/16"" beneath. Twin braking system locks blade securely in any position Non-slip rubber ôGrip-Track"" feet on the underside of the board allow the PXB to overhang the table edge at the perfect drawing angle bringing the work surface closer to you Foldaway back legs with rubber feet are unbreakable and enable you to use the board in either the flat or angled position Warp-free white Melamine« laminated board offers a smooth drawing surface that wipes clean with a damp cloth Comfortable carrying handle for portability Compact for out of the way storage.