25BI508 up for sale is a new steel black oxide coated tool holder bushing made by a manufacturer of cnc lathes , factory overstock , these have a 1 1/2 inch slide in diameter with two flats on the sides for lock screws , this has a inner diameter of 5/8 for a boring bar or other tool  , these have three small set screws to hold the tool inside the 5/8 diameter area , the total length is 4 1/2 inches and the flange on the front is 0.396 just under 3/8 this flange has a outer diameter of 1.892 inch , nice holder for your cnc lathe or other lathe project , see our store we find and add new items like this each week , thank you rwk