Diamond Core Bit Overshots With A Latching Mechanism For The Wire Line System

Overshots:

The overshot has a latching mechanism that connects to spear point on the top of the latching head to permit

retrieving the inner barrel from the bottom of the hole without the entire drill string having to be removed

The overshot is a necessary part of the wire line system.The overshot is used to lift the inner tube assembly to

ground from the bottom of the hole once the inner tube is full of core, because the overshot has a latching  mechanism  that connects to the spear point on the top of the latching head to permit retrieving the inner barrel, the entire drilling string need not to be removed