Looking to build your own spindles/uprights using a bolt-on hub spindle snout? Our spindle snout block is CNC machined in-house from aircraft quality 4130 chromoly that's 1/2" thick. It's 5" x 5" and uses the industry standard Dana 44 bolt pattern that we have doubled up (12 on 4" with 3.375" ID bore). The bolt holes are 3/8-24 and we recommend using mil-spec AS MS21250 series 12pt bolts to attach the snout with. These are machined for a slight press fit and most times requires post machining after welding and/or heat-treatment. Designed for all Camburg 12 bolt spindle snouts among many others We machine all sides and the top & bottom surfaces so everything is parallel. Nothing is laser or waterjet cut like cheaper versions.