We Sell Common Replacement Parts For
Chamberlain Made Garage Door Openers
Accessmaster, Chamberlain, LiftMaster, Raynor, Sears Craftsman
We Also Sell Common Genie Replacement Parts
The chain drive bullet attaches to the chain allowing the carriage to engage to the bullet. When the carriage is engaged it allows the garage door open and closed riding on the rail of the opener.