041A7278 12 tooth sprocket kit

The kit came with everything I needed to actuate my dead shaft roll up garage door. It fit perfectly on the roller and the lift master 3500 opener. Great product. Came with multiple spacers and all the mounting hardware plus the chain.

I purchased two liftmaster 3900’s for openers and need to add dead shaft sprockets and chain. This worked great, even though the description says 3950 only. Great parts and service, had a little delay on backorder. Gatehouse stepped up and shipped Fedex.

Good product. Exactly what I needed.