Fill the Stainless Steel Ice Lock with water and place it in the freezer in an upright position. Once completely frozen this locking device is ready to use. The O-rings at both ends are perfect for attaching cuffs or other restraints and the use of the lock ensures there is no escape until the ice melts. Dimensions: Measures 7.0 in. from O-ring to O-ring and 1.96 in. in diameter.