Semi Automatic Twist Lock has both containers locked and both wires are equally out. The Twist Lock has twisted cone for automatic locking and has few wear parts. The Twist Lock has dual function and is designed in such a manner that prevents accidental relock. The Twist Lock has lower container locked, manual function and has upper locked, lower unlocked semi automatic function. The Twist Lock has tensile strength of 40 tons, weight of 7.5 kg, hot dip galvanized finishing. The Twist Lock is safe and simple in operation and is easy to relock the twist lock if opened by mistake. The Twist Lock has one tool/ method for semi automatic and conventional operation. The Twist Lock has impact resistant stainless steel made wire and forged one piece shaft. The Semi Automatic Twist Lock does not interfere with any lashing bars and is easy to maintain.