The 333E two star stainless steel probe with paddle tip and eye hole is used to explore and gauge the depth of non-visible cavities. The eye may be used for carrying ligatures. The paddle is .9 x .2 x .25. The eye hole is .325 x .060Specs amp; FeaturesLaboratoryApplication: Eye hole is used to explore and gauge the depth of non-visible cavities. The eye may be used for carrying ligatures, Quality: , Surface Resistivity : Conductive, Shape: Straight, Material: SS, OAL: 6(150mm), Tip Width: Eye Hole .325 x .060