Idler/Tensioner Sprocket made out of steel. Compatible with #40/41/420 chain and has 16 Teeth. The bearing has an inside dimension of 1/2".
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I purchased to add to a lever to help keep my chain from coming off my Snapper mower based cart, BUT, I suggest GPS to offer some step down bushings that would slip into the I.D. of the bearing where buyer can use smaller diameter bolts to fit into the I.D. of the bearing.