“DSR” Hubs – for assembly with “AR” plate 
sprockets to make double-single of compound sprockets. Finish bore hubs have regular keyway and 2 setscrews.
Ready Sprockets are a variety of sprockets and hubs drilled and tapped for basic, convenient assembly with regular hex head cap screws. For No. 35 through No. 100 Chain, with stock finished bore hubs to accommodate shaft sizes through 2-3/4″ diameter, and also a variety of sq ., hex, spline, and tapered READY SPROCKET HUB TYPE DSR crucial bores.