Precisely machined for a perfect fit, the LRT-1 removes and installs the front chainring lockrings found on BoschA(R) Gen 2 e-bike motors once the crank arm is removed. Integrated 3/8" drive fitting allows compatibility with most ratchet handles and torque wrenches for tightening to proper torque specifications, and the heat-treated and plated 4140 steel construction ensures durability and long life. Fits lockrings with 50 mm outside diameter and 8 notches including: BoschA(R) Generation 2 Active Line (chainrings less than 20 teeth) BoschA(R) Generation 2 Performance Line BoschA(R) Generation 2 Performance Line CX DJIA(R) AvinoxA(R) Replacement for BoschA(R) 0275009003 tool. NOTE: Not designed for use with impact drivers or other power tools.