They work no matter what direction the filter is pointed..I have one I got 25+ years ago and have used it on many different vehicles to includes 72 D100--- 84 and 86 W150--- 93 Jeep cherokee--- 94 Chevy suburban--- 91 Dodge Daytona--- 93 W250 with Cummins--- 97 ram 1500--- 94 ram 2500 CTD--- 04 ram 1500 hemi--- 06 ram 2500 CTD --11 ram 2500 CTD ---12 Ram 2500 CTD----14 Ram 3500 CTD---99 Jeep wrangler--- 09 Challenger along with many other cars I have changed oil on for family members and never had a problem using the strap wrench..