Genuine LiftMaster® P/N K10-10371

This is a Genuine LiftMaster®  Straight Door Arm Replacement, P/N K10-10371 for use with LiftMaster® APT Series Commercial Apartment Door Operators. 

Also known as: P/N 1010371, K10-20371

1-1/4" Wide x 1/4" Thick, 17-7/8" overall length, with 5 - 3/8" ID holes on one end, spaced 2" apart & 1- 3/8" ID hole on opposite end

Check the manual or parts diagram for specific part information before ordering to ensure compatibility.