Engine Wrench Stainless Steel Skull Ring*For Back Order items, please allow 20 30 working days of crafting time. There are five styles of the ring here, and each style is composed of an engine, a wrench and a skull. Every locomotive enthusiast cannot lack an engine and a wrench, because this is a must have for a motorcycle. The skeleton represents the speed and courage to transcend death. This is an indispensable ring for motorcycle lovers! Get yours today. Size: about 18. 9 mm* 21. 2 mm