Choice of plain or geared.
Used on striaght or curved track, it can be installed or removed at any various size.
Adjustment is easy just remove one cotter pin and shift the spacers to fit your 1-beam.
Gearded trolleys come with 2 plain and 2 geared and include a cast iron hand chain wheel, hand chain guide and operating chain.
Geared trolleys are especially effective for presicion load spotting applications.