diff --git a/crates/kelocam-core/src/cnc/bit.rs b/crates/kelocam-core/src/cnc/bit.rs
new file mode 100644
index 0000000..98b02ce
--- /dev/null
+++ b/crates/kelocam-core/src/cnc/bit.rs
@@ -0,0 +1 @@
+pub trait ToolBit {}
diff --git a/crates/kelocam-core/src/cnc/mod.rs b/crates/kelocam-core/src/cnc/mod.rs
new file mode 100644
index 0000000..eed57e4
--- /dev/null
+++ b/crates/kelocam-core/src/cnc/mod.rs
@@ -0,0 +1,5 @@
+//! This crate offers traits and structs to represent CNC tooling & CNC machines.
+
+pub mod bit;
+
+pub use bit::ToolBit;
diff --git a/crates/kelocam-core/src/lib.rs b/crates/kelocam-core/src/lib.rs
index 23cd13c..2cda5d5 100644
--- a/crates/kelocam-core/src/lib.rs
+++ b/crates/kelocam-core/src/lib.rs
@@ -1 +1,2 @@
+pub mod cnc;
 pub mod primitives;