MR05032 Everhard Roll-n-chek silicone seam roller with seam tester probe Everhard's Patented Roll-N-Chek is the Tool features a seaming roller and seam tester on one tool Increases quality and efficiency of welded seam work AND saves you time and money on every job Combo tool that lets you roll out seam and test it with one hand. No fiddling needed. The specially shaped seam tester is also perfect for for tamping seams and detail work PATENTED. MADE IN USA. 1-7/16" dia X 1-3/4" wide silicone roller