These Clejuso 103 leg irons must rank as the most secure on the market. Weighing around a kilo, they are double locking with a 'Yale' type lock. The key can be removed from two separate positions - the full anti clockwise position being the completely locked setting. Turn the key about 45 degrees clockwise and the cuffs are ready to be used. Turning a further 45 degrees releases the mechanism. A truly impressive pair of leg irons, a real work of art and a 'must have' for the serious law enforcement/prisoner escort professional.