Kilner Needle Holder (152.4mm) (6inch)A Kilner needle holder box joint is a medical device used to hold and manipulate needles during surgical procedures. It is typically made of stainless steel and has a box joint design, which provides a secure grip on the needle. The box joint also allows for precise control of the needle's position and movement. The size of the needle holder (152. 4mm or 6 inch) will depend on the size of the needle being used.