Smart Jar Opener SMART and BEAUTIFULLY Designed. The best designed jar opener on Amazon. EFFORTLESSLY open any jars in seconds. EFFORTLESS Installation. Simply mount it underneath your cabinet with our ultra strong peel-and-stick adhesive tape. V-SHAPE is made with contoured dual silicone and serrated edges to provide optimum grip. OPEN any jar lids from 0.7 inches (2cm) to 6 inches (15cm).