10 Piece T37 Quick Change Holder. Spare Holders Quick Change (Also Listed In Our Shop). Holder Size - 58mm x 28mm x 28mm. 12mm Lathe tooling can be used. If the holder can be lowered below the topslide.Another great product by Bluefox Tools. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Quick Change Tool Post". The seller is "bluefox_tools" and is located in this country: IN. This item can be shipped worldwide.