The DeFelsko AT50TKIT 50 mm x 50 mm Tile Conversion Kit for PosiTest AT Adhesion Testers is an accessory for DeFelsko Adhesion Testers. Interchangeable stand-off allows a PosiTest ATM or ATA to pull 50 mm dollies conforming to ASTM C1583. Ideal for measuring the tensile strength of concrete surfaces and concrete repairs and overlay materials. Includes 50 mm C1583 steel dollies (4), 50 mm diamond grit cutting tool with arbor and 50 mm C1583 stand-off.