New item. This is a fly reel seat from Alps, an American rod building manufacturer. The model number is RA701L2SKC B. The inner diameter of the screw part is 14mm, the outer diameter of the screw part and the inner diameter of the upper reel lock part is 16.5mm, and the outer diameter of the insert part for the grip is 21.2mm. Because it is a slightly slender reel seat, it is recommended for use on rods from 2wt to 5wt. The screw is non-slip and tightens securely, and the overall construction is beautifully finished.