Automatic Operation With Spring Control Claws. Uses 670mm Conventional Chain (Included). Effective Straining Of All Types Of Wire At Post Or At Any Point Along The Fence. Pressed Steel Wire S Grips. **WARNING: Do Not Exceed Recommended Safe Operating Load Of 370kg Force (800 lbs). Never Extend Leverage To The Handle. Always Wear Eye Protection. Lubricate Moving Parts To Maximise Operational Life.