M14-1.50 x (Choose Length and Quantity) Class 10.9 Flange Fine Thread Bolts Yellow Zinc Plated Hardened Metric Bolt. Class is the hardness of metric bolts, similar to grade (grade 2, 5 or 8) that is used for standard bolts. Class 10.9 is often considered the metric grade 8 equivalent. These bolts would use an 18 mm wrench and have a 29 mm flange.
Bolt lengths 30 mm to 45 mm are threads the full length below the head. Bolt lengths 50 mm to 100 mm have an unthreaded portion before the threads start. See the second picture to get an idea of unthreaded portion for the different lengths. The second picture is for reference only.