Stanley 3/8" Heavy-Duty Staples, TRA706T/RTO-041: * Perfect for stapling jobs such as insulation, carpet underlaying and roofing felt * Color-coded packaging makes the size and product selection a cinch * Sturdy plastic packaging reduces staple breakage * Fits Stanley Tr100, Tr200, Tre500 series, Pht150, Pht250 and Arrow T-50