diff --git a/creader/ClusterFile.py b/creader/ClusterFile.py
index 6d60465..9a166b7 100644
--- a/creader/ClusterFile.py
+++ b/creader/ClusterFile.py
@@ -2,5 +2,22 @@
 from . import ClusterFileReader
 
 class ClusterFile(ClusterFileReader):
-    def __init__(self, fname):
-        super().__init__(fname)
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+
+    def __iter__(self):
+        return self
+    
+    def __next__(self):
+        clusters = self.read()
+        if clusters.size == 0:
+            raise StopIteration
+        else:
+            return clusters
+        
+    def __enter__(self):
+        return self
+    
+    def __exit__(self, exc_type, exc_value, traceback):
+        pass
\ No newline at end of file
diff --git a/src/ClusterReader.c b/src/ClusterReader.c
index 3682bc5..3631223 100644
--- a/src/ClusterReader.c
+++ b/src/ClusterReader.c
@@ -7,6 +7,7 @@
 typedef struct {
     PyObject_HEAD FILE *fp;
     int n_left;
+    Py_ssize_t chunk;
 } ClusterFileReader;
 //clang-format on
 
@@ -14,19 +15,38 @@ typedef struct {
 // raises python exception if something goes wrong
 // returned object should mean file is open and ready to read
 static int ClusterFileReader_init(ClusterFileReader *self, PyObject *args,
-                                  PyObject *Py_UNUSED(kwds)) {
+                                  PyObject *kwds) {
 
     // Parse file name, accepts string or pathlike objects
     const char *fname = NULL;
-    PyObject *buf;
+    self->n_left = 0;
+    self->chunk = 0;
+    PyObject *fname_obj = NULL;
+    PyObject *fname_bytes = NULL;
     Py_ssize_t len;
 
-    if (!PyArg_ParseTuple(args, "O&", PyUnicode_FSConverter, &buf))
+    static char *kwlist[] = {"fname", "chunk", NULL};
+
+    // if (!PyArg_ParseTuple(args, "O&", PyUnicode_FSConverter, &buf))
+    //     return -1;
+    // PyBytes_AsStringAndSize(buf, &fname, &len);
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|n", kwlist, &fname_obj,
+                                     &self->chunk)) {
         return -1;
-    PyBytes_AsStringAndSize(buf, &fname, &len);
+    }
+
+    if (fname_obj != Py_None)
+        if (!PyUnicode_FSConverter(fname_obj, &fname_bytes))
+            return -1;
+
+    PyBytes_AsStringAndSize(fname_bytes, &fname, &len);
+#ifdef CR_VERBOSE
+    printf("Opening: %s\n chunk: %lu\n", fname, self->chunk);
+#endif
 
     self->fp = fopen(fname, "rb");
-    self->n_left = 0;
+    
 
     // Keep the return code to not return before releasing buffer
     int rc = 0;
@@ -37,7 +57,7 @@ static int ClusterFileReader_init(ClusterFileReader *self, PyObject *args,
         rc = -1;
     }
     // Release buffer
-    Py_DECREF(buf);
+    Py_DECREF(fname_bytes);
 
     // Success or fail
     return rc;
@@ -63,11 +83,15 @@ static PyObject *ClusterFileReader_read(ClusterFileReader *self,
     Py_ssize_t size = 0;
     PyObject *noise_obj = NULL;
     PyObject *noise_array = NULL;
-    if (!PyArg_ParseTuple(args, "n|O", &size, &noise_obj)) {
+    if (!PyArg_ParseTuple(args, "|nO", &size, &noise_obj)) {
         PyErr_SetString(PyExc_TypeError, "Could not parse args.");
         return NULL;
     }
 
+    // Fall back on object default/config
+    if (size == 0)
+        size = self->chunk;
+
     npy_intp dims[] = {size};
 
     // If possible numpy will
diff --git a/src/RawFileReader.c b/src/RawFileReader.c
index 0721fb7..74c0daf 100644
--- a/src/RawFileReader.c
+++ b/src/RawFileReader.c
@@ -41,8 +41,9 @@ static int RawFileReader_init(RawFileReader *self, PyObject *args,
             return -1;
 
     PyBytes_AsStringAndSize(fname_bytes, &fname, &len);
-    printf("%s\n read_header: %d\n", fname, self->read_header);
-
+#ifdef CR_VERBOSE
+    printf("fname: %s\n read_header: %d\n", fname, self->read_header);
+#endif
     self->fp = fopen(fname, "rb");
 
 
diff --git a/tests/test_ClusterReader.py b/tests/test_ClusterReader.py
index 9337eed..95fa71c 100644
--- a/tests/test_ClusterReader.py
+++ b/tests/test_ClusterReader.py
@@ -114,4 +114,11 @@ def test_read_file_with_noise_mask(data_path):
     noise_cut[133,80] = 0
     r = ClusterFileReader(fname)
     cl = r.read(85, noise_cut)
-    assert cl.size == 10
\ No newline at end of file
+    assert cl.size == 10
+
+def test_chunk_config(data_path):
+    fname= data_path/'noise_test.clust'
+    #File contains total 70 clusters
+    r = ClusterFileReader(fname, chunk = 5)
+    assert r.read().size == 5
+    assert r.read(10).size == 10
\ No newline at end of file