This is a single 46 teeth chain wheel, made by thun the well known producer of bike parts
Made for use with a 3/32" width chain as used on multi speed bikes
170mm alloy cotterless arm
Takes standard 9/16” pedals
Very light only weighs 307 grams (approx)
You are only buying the chainwheel as pictured, it does not come with a left crank, sorry we do not have the matching left arm