Input Shaft is 1-1/4" and 2-1/16" LongTakes 3/8" Shearbolt and has groove for safety ring in case Shearbolt breaksOutput Shaft2" (51mm) and 4-5/16" LongHas two 1/2" hole for shearpins (this attaches to auger bit)15/16" Pin for 1" holes in Ears5-1/4" I.D. Between EarsFrom the top of shaft to 1st hole it is 5/8" to Center Hole and from top of shaft to 2nd hole it is 2-5/8" to CenterOn the Ears for mounting it is 5-3/8" Inside to Inside and 6-5/8" Outside to Outside Weighs: 68lbs and Ships UPS3:18:1 RatioHeavy Duty!We carry ALL replacement Parts Also! Contact Us if you Dont see what You are Looking for!