Constant-tension hose clamps are fast becoming ubiquitous on mass-produced cars, courtesy of their stone-cold reliability and automatic adjustment. Worm gear and T-bolt hose clamps should be re-torqued after installation with the hoses hot, since the clamping force squeezes rubber out from underneath the band (a tendency called cold creep), but constant-tension clamps keep themselves properly adjusted. They are, however, one of a mechanic’s knuckles’ worst enemies, and very difficult to detach without the right tools. Additionally, factory installations aren’t always the easiest to remove, which is where flexible hose clamp pliers come in.
Capable of reaching into incredibly tight spaces and securely compressing clamp tabs, the pliers are nearly a must if you service late-model cars or use constant-tension clamps in any application. Personally, I like them more than worm-gear clamps; simpler and maintenance-free, they’re well worth having another piece in my collection. Astro Pneumatic makes a good set you can find for $29 before shipping from S&J’s Discount Tool, which seems to be one of the best prices online. Not many auto parts stores will have good-quality versions, though you might get lucky at your local NAPA.
Astro Pneumatic flexible constant-tension hose clamp pliers [S&J’s Discount Tool]
Street pricing [Google Products]