The steels fine, 600-grit diamond surface is ideal for sharpening and honing almost any knife * But it¿s the opening mechanism that will really give you a kick. * Inspired by the quick action of a switchblade * The glass-filled handle has soft-touch over-molding for a secure grip. * Steel:600-grit diamond-impregnated steel; Handle: Double injection-molded Santoprene , black & gray * A simple push up on the button automatically release the steel from the handle, while a pull back automatically retracts it * Blade: 3-1/8 in. (7.9 cm); Closed: 4-1/2 in. (11.3 cm); Overall: 8 in. (20.3 cm); Weight: 3.4 oz