This 10 feet long form liner is 3" inches tall/wide by 2" thick and designed to be fastened directly to the substrate with common wood screws spaced approximately 3" apart, with no need to silicone edges. Because of their flexibility and strength, they can be curved or shaped for most projects and cut to length easily with a utility knife to fit your form. They create a detailed edge on concrete and can be used in both precast and poured-in-place concrete work with easy clean-up to be re-used hundreds of times. Create your own concrete countertops, wall caps, column caps, window sills, lintels, trim, etc.