Create orthographic views of the given 3D object based on the provided dimensions.

Step 1: Identify key dimensions from orthographic views (all units mm).

Front view:

• Overall height: $75.0$
• Base width: $25.0$
• Step height: $15.0$
• Step projection: $12.5$
• Hole diameter: $20.0$

Top view:

• Overall length: $60.0$
• Depth: $40.0$
• Section lengths: $20.0$, $30.0$
• Hole diameter: $20.0$

Side view:

• Heights confirm $75.0$, $15.0$
• Length $60.0$, depth $40.0$
• Additional hole? $10.0$

Step 2: Set up isometric projection.

• Draw horizontal line for length ($60.0$ mm).
• Draw 30° lines for depth ($40.0$ mm) and height ($75.0$ mm).
• Scale: true lengths along axes; circles become ellipses (minor axis = diameter, major axis = diameter / \cos 30^\circ = diameter \times \frac{2}{\sqrt{3}}).

Step 3: Draw main vertical block (back plate).

• Front face: parallelogram $25.0$ mm horizontal $\times 75.0$ mm at 30°.
• Top face: extend $40.0$ mm at -30° from top edge.
• Side face: extend $60.0$ mm horizontal from side edge.
• Bottom face if visible.

Step 4: Add lower step block (attached at base left).

• Block $12.5$ mm horizontal $\times 15.0$ mm at 30° $\times 40.0$ mm depth.
• Align with front view step position.

Step 5: Draw holes.

• Main hole ($ø20.0$): ellipse centered per front/top views, visible on front and top faces.
  • Axes: minor $20.0$ mm vertical, major $\approx 23.1$ mm at 30°.
• Second hole if present ($ø10.0$): similar, position per views.

Step 6: Add visible edges and fillets/chamfers if indicated (none prominent).

Step 7: Label all dimensions on visible faces matching orthographic (e.g., $75.0$, $60.0$, $40.0$, $25.0$, $20.0$, $15.0$, $12.5$, $30.0$).

Isometric view constructed with L-shape: vertical back $75.0 \times 60.0 \times 25.0$ mm, forward step flange $15.0 \times 30.0 \times 40.0$ mm approx., holes at specified positions.

Isometric view per steps above (use engineering drawing tools for precise sketch)