Boston Gear H1616L Plain Helical Gear， 45 Degree Helix， 14.5 Degree Pressure Angle， 0.500 Bore， 16 Pitch， 16 Teeth， Steel， LH</br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/41VG%2B2T1DPL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51LZv3diQeL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/51BWVTxJpRL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/41Rn31QOgVL.jpg' noproxy></br><img src='http://ecx.images-amazon.com/images/I/31jgKLOw9cL.jpg' noproxy></br>