FeaturesStanley Staples 12mm Pack of 1000 1-TRA708TFor heavy duty staplingJobs such as insulation carpet under laying and roofing feltHeavy Duty Narrow Crown fits TR100 TR200 TRE500 series PHT150 PHT250 and Arrow T-50Pack of 1000Designed for heavy-duty use in construction, this Stanley SharpShooter Heavy Duty 12mm 1/2in Type G Staples (Pack of 1000) is the ideal choice for a range of demanding tasks. With a more discrete narrow crown and 12mm 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.