Metal skewers are typically stainless steel and will have a pointed tip on one end and a grip of some kind on the other end for ease of removing the food. Metal skewers are recommended for reuse, whereas wooden skewers are not.
When grilling, wooden skewers must be soaked in water prior to assembling and cooking to avoid burning. Wooden skewers are most often made from bamboo, however other woods may be used.
The phrase "to be skewered" is used as slang for "to be stabbed".