This is a new Ardisam J4517 transmission for Jiffy model 30 Ice Auger. It reduces RPM 15:1. Here's an application chart from Ardisam Site (check their part use table below). Clutch size, mounting holes, and output shaft pictured. Local, cash buyers only. Could be adapted to reduce RPM in other applications. More than 12 available. Dealer inquiries welcome. Thanks for looking.