WinLock® - Ultra Performance Pre-Stretch Hand Film. We are an industry pioneer for oriented, high-strength hand wrap films. Berry's commitment to innovation has kept us a leader in stretch film technology for over 40 years, with next generation solutions helping customers do more with less. Oriented film uses less material versus conventional hand films and enables user to apply consistent wrapping force. Folded outside edges reduce neck down during wrapping to allow full use of the film width and prevents roll damage and wasted material. Superior puncture and tear resistance even at low gauges.