Grey Metal Drywall Corner Beads feature a grey galvanized surface coating and products providing superior corrosion protection. Bullnose profiles are available in both 3/4″ and 1-1/2″ radius. Flanges have deeply knurled mud anchors and etched surfaces for ease of joint compound adhesion and nail attachment. This drywall finishing product is nailed, stapled, screwed or clinched into place.