Here is a new Oregon power mate Sprocket drive rim - 7 tooth 3/8 pitch. Small 7 spline.This is part# 18720. Oregon rims have wear depth indicators to tell when to replace. It fits small 7 spline sprockets. Oregon makes a standard 7 spline and a small 7 spline. If a penny fits inside the rim- it is a small 7 spline. If a nickel fits inside - then it is a standard 7 spline. Make sure to buy the correct one. Pictures are of the actual item and capable of describing this item better than words.
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