https://www.mrosupply.com/speed-reducers/96713044_30759087_boston-gear/
Boston Gear 30759087 SSHF7210W-30KCT-B5-HS5-P20 30:1 Stainless Steel Worm Gear Speed Reducer 2.1"...
Boston Gear 30759087 SSHF7210W-30KCT-B5-HS5-P20 30:1 stainless steel worm gear speed reducer, 2.1" center distance, 56C quill flange, 1-1/4" hollow bore output.