Choice of plain or geared.
Used on striaght or curved track, it can be installed or removed at any various size.
1-beam.
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.