20 mm stainless tang buckle - CAD model, STEP and drawings

My own design study, not a client project: a 20 mm watch-strap tang buckle in 316L stainless steel, built as a parametric B-rep model and exported to STEP and STL. Three parts: frame, tongue and a standard 1.8 mm spring bar. I set the fits for production: drilled-through holes 1.10 +0.05/0 mm for the spring-bar tips, a 20.00 +0.10/0 mm strap gap and a 2.40 mm tongue seat, then checked clearances and the tongue swing on the solids. Two A3 drawings (PDF and DXF) with sections, tolerances, a parts list and notes for CNC prototypes and MIM series parts. Studio renders in Blender. Not manufactured or tested.