# HoleFill

> Material placed in the annular space between the casing and the borehole wall.

> **HoleFill** = `object`

Material placed in the annular space between the casing and the borehole wall.

## Properties

### description

> **description**: `string`

Material description (e.g. grain size, material name).

***

### diameter

> **diameter**: `number`

Outer diameter of the filled annulus in millimeters.

***

### from

> **from**: `number`

Start depth in meters from ground level.

***

### to

> **to**: `number`

End depth in meters from ground level.

***

### type

> **type**: `"gravel_pack"` \| `"seal"`

Fill category: `gravel_pack` for filter gravel, `seal` for cement or bentonite.