A narrower groove provides more contact. The extra ring around the center eliminates the flex found on cheaper tools. Like other reviewers, we struggled using a locally purchased tool to just round the corners of the sensor's hexagon. The CTA tool immediately caught and bit. The O2 sensor unscrews in seconds without slipping. Have used (and broken) several sensor connectors over the years and this has had none of these issues. I doubt I'll ever have trouble with an O2 sensor again. Worth every dollar.
LEDAUT M18X1.5 Stainless Steel Stepped Mounting Bung And Plug Fittings (2 Bungs/2 Plugs) For Welding
20 Review
Xiaomi Clear Grass temperature and humidity sensor (CGG1), white
13 Review
Calibrated ITEQ Brake Fluid Tester Pen With 5 LED Indicators For Accurate Testing Of DOT3 And DOT4 Brake Fluids
30 Review
OnePlus Ace Pro 16/256 GB CN Smartphone, 2 nano SIM, Black
20 Review
Off-Road Fender Flares For Jeep Wrangler 2007-2018 JK & JKU Unlimited - Heavy Duty Flat Textured Steel Mud Guards In Black (Set Of 4) By Hikotor For Front And Rear Replacement (2 Or 4 Door Options)
47 Review
25Pcs Fender Liner Screws For Toyota Avalon Camry Corolla Scion Lexus - OEM #90159-60498
35 Review
820Pcs Car Push Retainer Clips & Fasteners Assortment - Ford GM Toyota Honda Chrysler BMW Benz Nissan Subaru Audi Mazda
32 Review
Gooacc 50Pcs Hood Insulation Retainer Clips - Perfect Replacement For Grand Cherokee, Dodge Ram, Chrysler PT Cruiser, Plymouth Laser, Neon - OEM Part Number: 4878883AA
33 Review