Primacoustic F101 1015 00 Cobra Triple Grip Anchors. This multi-purpose plastic anchor kit can be used in drywall, plaster, brick and concrete block to fasten Primacoustic Impalers. Unique triple action design grips in three ways: claws, expanding split core and locking toggle wings. Includes masonry drill bit, 100 anchors and 100 screws.