Kit includes 25 SnowCatchers with 2 screws per guard (third hole is not used) and a foam sealer pad. No need for silicone. Thick 16 gauge Mill Kodiak Bear SnowCatcher snow guards are made from 304 grade stainless steel Features a large 4.5” wide forward mounted face prevents to snow slides on metal roofs. 1.5” wide base mounts in the flat between the minor ribs of most 36” panels with 9” or 12" rib spacing. Kodiak Bear Shaped SnowCatcher snow guards were tested to hold up to 3945 pounds with 2 screws. Ornamental snow guards are a very popular option to decorate metal roofs while preventing snow slides. The durable 304 stainless steel construction does not get brittle like cheap fabricated cast guards. Installation is fast and simple because each of the pre-drilled snow guards come with 2 screws and a user applied foam sealer pad. This eliminates the need for drilling out the holes and handling messy silicone while on the roof. The third hole is only used for hanging the SnowCatcher when painting to match the roof. The product is sold in this listing is mill finish. Snow guards should always be staggered across an entire roof area and spaced close enough (usually 1 per valley) to prevent the movement of snow and ice. On longer runs and steeper roof pitches multiple patterns going up the roof may be required. Snow Guards should never be placed in isolated areas such as just over a doorway or behind vent pipes. Please contact us or use our online snow guard spacing tool for proper spacing recommendations.