The one is a side mill cutter - new, but has factory wear on it. National Twist and is in-line. The other is dipped in wax and is off-set. BOTH are same size - 6 inch diameter. The off-set is maybe a bit wider, but same chuck size.Please look at my other Machinists tools/blades/bits We bought alot of a reputable shop that went out of business. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Metalworking Equipment\Machining Centers & Milling Machines". The seller is "crochrc" and is located in this country: US. This item can be shipped worldwide.