Easy to Use: Just use a screwdriver to tighten or loosen the screw of the hose clamp, then adjust it to your desired size and fasten the hose clamp in place. Including 30PCS 1/4-7/16"(6-12mm),30PCS 3/8-5/8"(10-16mm),40PCS 1/2-3/4"(13-19mm),30PCS 5/8-1"(16-25mm),30PCS 3/4-1-1/8"(19-29mm),25PCS 3/4-1-1/4"(18-32mm),5PCS 13/16-1-1/2"(21-38mm),10PCS 1-2"(27-51mm) with socket wrench and screwdriver.
