The Black Library Warhammer 40K Steel Tread is a limited edition hardcover book published by Games Workshop in the United Kingdom. This army book focuses on the Astra Militarum, specifically the Cadian Shock Troopers, providing in-depth details and lore for players of the Warhammer 40K game. Written in English, this book is a valuable resource for fans of the Warhammer universe looking to enhance their gaming experience with the iconic Cadian army.