Wide grip range Reduced inventory Vibration & moisture resistant Accommodates oversized and irregular sized holes, Dome Head: Standard low-profile head, suitable for most applications. Countersunk Head: 120ยบ head design. Used wherever a flush surface is required. Large Flange: For use where thin, brittle, soft, or vulnerable materials are fastened. Provides large bearing surface on primary side; ideal for covering enlarged holes or slots.