When you need to bend around a corner, or even to supplement your valley roof needs, this pack is a must for larger builds. Straight, valley, and hip roofs have biscuit and half pole accessory holes to help them attach. Straight and hip roofs are magnetic. Straight and valley roofs have half pole accessory holes on top for use with scaffolding or ridges. This unpainted set is identical to Modular Roof - Right Angle Junction - Green (Unpainted).