Band Clamp: Galvanized Steel, 3/4 in – 1 1/2 in Clamping Dia, Center-Punch, 5/8 in Band Wd-pkg. of 10Band Clamp: Galvanized Steel, 3 4 in 1 1 2 in Clamping Dia, Center Punch, 5 8 in Band Wd pkg. of 10 Light duty buckle on clamps are installed and tightened with a clamping tool that has a built in conical punch. The integrated buckle is locked by striking the punch with a hammer. They are suitable for hoses in non pressurized applications and are not recommended for use with plastic fittings that could crack. Brand BAND IT Band Clamp Type Center Punch