Features: _x000D_Made of 45 steel, black oxide finish, features high hardness, high strength, durable in use. _x000D_Undersized to fit machine table slot case hardened._x000D__x000D_It is used for T-slot aluminum extrusions to connect other parts. _x000D_Bottom of T-Slot nut is staked to prevent the stud from protrusion. _x000D_T-Slot nuts enable the user to add clamps to a fixture without tearing down existing clamps. _x000D__x000D_Specifications: _x000D_Material: 45 steel _x000D_Surface treatment: black oxide _x000D_Thread: M12 _x000D_Size: as the picture _x000D_Weight: 235g _x000D__x000D__x000D_Package Included: _x000D_5 x T Slot Nuts 1Made of 45 steel ,black oxide finish, features high hardness, high strength, durable in use 2Undersized to fit machine table slot case hardened 3It is used for T-slot aluminum extrusions to connect other parts 4Bottom of T-Slot nut Is staked to prevent the stud from protrusion 5T-Slot nuts enable the user to add clamps to a fixture without tearing down existing clamps