Designed for heavy duty use in construction this pack of 1 000 stanley sharpshooter heavy duty staples is the ideal choice for a range of demanding tasks with a more discrete narrow crown and 10mm size their durable design makes them suitable for installing insulation carpet underlay and roofing felt this type g staple is designed to fit a range of staplers including the tr100 tre500 series and arrow t 50 heavy duty type g staples for construction designed for insulation carpet underlay