About Park Tool Lockring Tool (LRT-3)Precisely machined for a perfect fit, the LRT-3 removes and installs the lockrings that retain direct-mount chainrings found on some Specialized®, Cannondale® and FSA® modular cranks. Features a 36 mm hex fitting for use with the Park Tool TWB-36 Crow Foot and a torque wrench (each available separately) to achieve proper torque. Heat-treated and plated 4140 steel construction ensures durability and long life. Features Fits lockrings with 47–48 mm outside diameter and 4 or 8 notches including: Cannondale® Hollowgram FSA® BB386EVO FSA® BB392EVO FSA® MegaExo Specialized® S-Works About Park ToolPark Tool are the world's largest bicycle tool manufacturer. Located in St. Paul Minnesota they have been designing and manufacturing bicycle specific tools since 1963. Their dedication to quality and innovation have gained them the reputation for producing the best bicycle tools in the world.