The Ramset 4RS27 Box of 10 #4 "Yellow" 27 Cal Strip Loads is designed for use with compatible powder-actuated tools to drive fasteners into tough materials such as concrete and steel. These #4 yellow strip loads provide consistent power and performance for various fastening applications. Key Features: Caliber: 27 Cal Power Level: #4 (Yellow) Strip Type: 10-shot strip Quantity: Sold in packs of 2 (each box contains 10 strips) Application: Designed for driving pins into concrete, masonry, and steel Compatibility: For use with Ramset and other compatible powder-actuated tools