This a Drive Gear for a RAYNOR FLITESTAR 1/2HP chain drive garage door opener model FLTSTR ,, mfg. date 8/97. It is a 20 toothed gear located in the gearbox that drives the main sprocket shaft,is used was Recently tested and works fine, no problems. http://doorsopen.ecrater.com/product.php?pid=1562941(1049)