This is a new Ardisam J4517 transmission for Jiffy model 30 Ice Auger. It reduces RPM 15:1. Purchased some time ago for $60 to repair my off -brand auger. Waited a bit too long to check the fit, beyond the return period. Here's an application chart from Ardisam Site (check their part use table). Clutch size, mounting holes, and output shaft pictured. Local, cash buyers only. Could be adapted to reduce RPM in other applications. Thanks for looking.