This Briggs and Stratton 17 HP I/C Engine Crank Shaft is a high-quality replacement part for your lawn mower. It is made of durable alloy steel and is compatible with Briggs and Stratton brand engines. The crank shaft has a diameter of 7/8" x 3 1/8" and a length of 18 inches. It is designed to provide reliable and efficient performance for your lawn mower.