We have this  100% perfect working unit for sale here, but we do also have many more CAT 50 and Cat 40 tool holders for sale in our EBAY store,, But you will get FREE Shipping Cost After the 1st one purchased. Our inhouse Veteran Machinist inspected this unit and says it Looks to be in near New condition and 100% Perfect working order. This has 20mm threaded bolt that is hollow for Fluid Through if needed.  We do have other Cat50 and Cat40 Tool Holders for sale, we can combine shipping. Check our EBAY Store for more.