Oh fer cool. This unique Tractor Tire Tread modeled after a Farmall. Makes a cool border or pattern. What else could you do with it? 
Choose:
>> Straight. Set on 3/16x1/2" stock. Design actual 12.05x2.3mm.
>> Curved. Set on 3/16x1/2" stock. Design actual 11.25x3.4mm. Left or Right curve. Left curve is pictured..
As shown on the stamp/tool itself, as always.
These are sawed, filed, sanded and engraved by me. 
They will each be a little different, as I make one for you special.
3" long shank, hardened and then tempered tool steel.