Already fresher kai liye free site engineer course hai .. App download karlo aur shiko .. Drawing reading ka course bi hai , purchase karke shik sakte ho .
Depend karta hai drawing pai . In few drawings it will be 150 mm or 6 inches . Thode time nahi diya jata hai , aapko calculate karna hota hai . Overall depth minus top and bottom cover , will give u ' L ' ... Hope u have understood . Happy Learning aniket bhawari ! Have a great day .