Kadee #821 1 Scale Centerset Short Shank Couplers with Extra Short Body Mount Gearboxes - Black
Body mount coupler with extra small gear box for locomotives and cars where space is too restrictive for standard gear boxes.
Includes: 2 ea couplers, 2 ea draft gear boxes, 2 ea draft gear box lids, 6 ea #877 centering springs, 1 ea #1875 1-Scale knuckle spring, 4 ea 2-56 screws and 4 ea 2-56 nuts
(Gear Boxes: 17/32" long x 5/8" wide x 9/32" high)