Non-magneiic locking sleeve

A non-magnetic locking sleeve comprising:

• a body, said body including a second section, a first section connected to one end of said second section, and a locking socket recessed into another end of said second section and adapted to accommodate a fastener, said locking socket being configured with an outside opening enclosed within and defined by a plurality of peripheral walls, wherein said plurality of peripheral walls are connected in a continuous sequence to one another at respective joints, wherein each joint is formed between adjacent peripheral walls of said plurality of peripheral walls, a positioning groove recessed in a continuous configuration into said plurality of peripheral walls and extending in a crossing relationship with a longitudinal axis of said locking socket, and a plurality of recessed portions, each recessed portion of said plurality thereof being formed at a respective joint between respective adjacent peripheral walls;
• and
• an engagement unit disposed inside said positioning groove of said body, said engagement unit having a periphery configured with six engaging surfaces arranged in a hexagonal configuration, one surface of said six engaging surfaces of the engagement unit extending continuously to define an enclosure for receiving the fastener therein, wherein said engagement unit is disposed in said positioning groove with said one surface of said six engaging surfaces embracing the fastener in a direct contact with the peripheral surface of the fastener inserted into said enclosure defined by said one surface of the engagement unit in the locking socket to thereby hold the fastener in position.