Expansive Bit

Expansive bits are a type of drill bit used for drilling large holes in wood or other soft materials. They are also known as adjustable or adjustable circle cutters.

These bits have a central point and a set of cutting blades that can be adjusted to different diameters. This allows them to create holes of various sizes without the need for multiple drill bits.

Expansive bits are commonly used in woodworking and carpentry projects where precise and adjustable hole sizes are required. They are often used for tasks such as installing door locks, creating holes for pipes or cables, or making holes for dowels or plugs.

To use an expansive bit, you would typically adjust the blades to the desired diameter, secure the bit in a drill chuck, and then drill into the material using a slow and steady motion. The blades will cut into the material, creating a clean and accurate hole.

It's important to note that expansive bits are designed for use with softer materials like wood, and may not be suitable for drilling into harder materials like metal or concrete.