3D Mechanical Parts Modeling

I need 3D models of mechanical parts. The models should be in STEP format. Please note, the two items size should fit into the tray. So basically, we are looking at the set of three items.

Requirements:
- Create detailed 3D models for three mechanical parts.
- Deliver in STEP format

Ideal skills and experience:
- Proficiency in CAD software
- Experience in creating detailed 3D mechanical models
- Attention to detail and accuracy