Strong buckle for strap

Strong 2-bar buckle for 20, 25 and 30 mm straps with minimalistic supports built into model
Other names: wing buckle, пряжка-крыло, трехщелевая пряжка, трехщелевка

Overall shape is inspired by some really good noname buckle bought at local store

FreeCad model can be configured to fit any strap width starting from 16mm