**Core Concept**
Split thickness skin grafts (STSGs) are a type of skin graft used in various surgical procedures, including maxillofacial surgery, to cover large areas of damaged or missing skin. The thickness of the graft is critical in determining its suitability for a particular site and the likelihood of successful graft take.

**Why the Correct Answer is Right**
The thickness of STSGs is typically measured in thousandths of an inch (0.001 inches) or in millimeters. In maxillofacial surgery, a graft thickness of 0.018-0.020 inches (0.45-0.51 mm) is commonly used. This thickness provides a good balance between graft take and the risk of complications such as contracture or graft failure. The thinner grafts are more prone to contracture, while thicker grafts may be more resistant to take.

**Why Each Wrong Option is Incorrect**
**Option A:** Thinner grafts (0.010-0.015 inches or 0.25-0.38 mm) are often used in areas where mobility is critical, such as the hands or feet. They are not suitable for maxillofacial surgery due to the risk of contracture.
**Option B:** Thicker grafts (0.025-0.030 inches or 0.64-0.76 mm) may be used in areas with significant tissue loss or in patients with poor wound healing. However, they are not typically used in maxillofacial surgery due to the increased risk of graft failure.
**Option C:** The correct answer is not listed here.

**Clinical Pearl / High-Yield Fact**
When selecting the thickness of a split thickness skin graft, it is essential to consider the patient's overall health, the extent of tissue loss, and the specific requirements of the surgical site. A general rule of thumb is to use the thinnest graft possible that will still provide adequate coverage and prevent complications.

**Correct Answer: C. 0.018-0.020 inches (0.45-0.51 mm).