You can find clamps for less, but then they must be replaced when the screw rusts away. These quality clamps are all stainless steel (#301SS band) including the screw (#410SS)! The one-piece housing is locked to the band without spot welds. The band is 9/16” wide (5/16” on SSAA) and the screw has both a slotted head and a 5/16” hex. Choose clamps with a larger maximum diameter than the outside diameter (O.D.) of the tubing that it will be holding. Made in USA.